1、Section Learning about Language&Using LanguageUnit 3 Under the sea栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea重点单词写作词汇1._ vi.慢跑 vt.轻推；轻撞 2._ n.目标；靶；受批评的对象 3._ adj.纯的；纯粹的；纯洁的jogtargetpure栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea4._ adj.口好的；整齐的；匀称的 5._ adj.&n.灰色(的)6._ adj.浅的
2、；肤浅的；浅显的 7._ adj.陡峭的neatgreyshallowsteep栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea拓展词汇8._ vi.思考 vt.映射；反射；思考reflection n反映 9._ adj.意识到的；知道的awareness n意识 10._ adj.生动的；鲜明的；鲜艳的vividly adv.清晰地 11._ adj.狭窄的；有限的；狭隘的narrowly adv.勉强地；狭窄地；严密地reflectawarevividnarrow栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导
3、引语篇理解Unit 3 Under the sea12._ adj.锐利的；锋利的；敏捷的sharpen vt.&vi.削尖；磨快；尖锐；变锋利 13._ adj.好吃的；可口的taste n味道 vi.尝起来 vt.品尝 14._ vt.恐吓 vi.受惊吓scared adj.害怕的 15._ n养老金；退休金pensioner n领取养老金者sharptastyscarepension栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea阅读词汇 n _ 17.tide n _ 18.cell n._ 19.seaweed n._
4、20.flashlight n _网；网状物；网络潮(汐)；潮水；潮流细胞；(蜂房的)巢室海草；海藻闪光信号灯；手电筒；闪光灯栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea21.suck vt.&vi._ 22.turtle n._ 23.boundary n _ 24.awesome adj._ 25.seal n _吮吸海龟；龟；甲鱼界限；分界线使人敬畏的；令人畏惧的海豹；封条；印章栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea重点短语1._ 处于的危险中 2
5、._被困于 3._醒来 4._对知道、明白；意识到5._ 上下翻转 6._靠近 7._阻止某人做某事 8._吓死了be in danger ofbe trapped/caught inwake upbe/become aware ofupside downget close tostop sb.from doing sth.(be)scared to death栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea重点句型1.with 复 合 结 构：I m sitting in the warm night air _(手 里 拿 着
6、 一 瓶 冷 饮)and reflecting on the daya day of pure magic！2.where 引导地点状语从句：The water was quite shallow but _(珊瑚礁的尽头),there was a steep drop to the sandy ocean floor.with a cold drink in my handwhere the reef ended栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaRead the text carefully and choose
7、the best answer.1In the diary，the author mainly wants to tell us _Awhat he saw in the seaBhow the fish eat in the seaCthe vivid colours in the seaDall the plants in the sea are poisonous栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea2What was hanging upside down in the sea according to the
8、text?AThe orange and white fish.BThe yellowspotted red seaslug.CThe yellow and green parrotfish.DThe orange and bluestriped angelfish.3How many kinds of creatures didnt the author want to get too close to according to the fourth paragraph?ATwo.BThree.CFour.DFive.栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解U
9、nit 3 Under the sea4From the whole text we know that the author felt that _Ahe was a tiny spot compared with the sea worldBthe ocean was a tiny spot compared with the whole worldCthere was no danger in the sea except sharksDall kinds of fish were waiting for something for food答案：14.ACBA栏目导引教材助读解疑清障要
10、点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seadimensiondImennn.维(数)；方面；侧面reflectrIflektvi.思考 vt.映射；反射；思考reflect on 仔细思考；考虑purepjadj.纯的；纯粹的；纯洁的snorkelsnklvi.戴潜水通气管潜泳 n.(潜水艇或潜水者的)通气管go snorkelling 戴着呼吸器潜泳栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaoffshorefadv.&adj.近海(的)；离岸(的)fantastic adj.奇妙
11、的，令人惊奇的cellseln.细胞；(蜂房的)巢室wake up 醒来；唤醒be/become aware of 对知道、明白；意识到awareweadj.意识到的；知道的vividvIvIdadj.生动的；鲜明的；鲜艳的栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seasurround vt.环绕，围绕horn n(牛、羊、鹿等的)角；号角；喇叭；警报器neatnitadj.口好的；整齐的；匀称的mind(sb./ones)doing sth.介意(某人)做某事(mind 后接动名词或动名词的复合结构)seaweedsiwidn
12、.海草；海藻narrownradj.狭窄的；有限的；狭隘的栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seapassage n通道；走廊；短文flashlightfllaItn.闪光信号灯；手电筒；闪光灯upside down 上下翻转suckskvt.&vi.吮吸21 yellowspotted adj.带着黄斑点的22 sea-slugsisln.海蛞蝓栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea23 wiselooking adj.长相聪慧的24 turtle
13、ttln.海龟；龟；甲鱼25 eeliln.鳗；鳝26 sharppadj.锐利的；锋利的；敏捷的27 tastyteIstIadj.好吃的；可口的28 giantdaIntadj.巨人的；巨大的 n.巨人；伟人29 clamklmn.蛤30 in between 在之间栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea31 greyreIadj.&n.灰色(的)32(be)scared to death 吓死了scareskevt.恐吓vi.受惊吓33 shallowladj.浅的；肤浅的；浅显的34 steepstipadj.陡
14、峭的栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea35 boundarybandrIn.界限；分界线36 wildly adv.急剧地；失控地；紊乱地37(be)exposed in 暴露在中 be exposed to 接触，暴露给38 limitless adj.无限的栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaA NEW DIMENSION OF LIFE19th JanuaryIm sitting in the warm night air with a
15、 cold drink in my hand and reflecting on the daya day of pure magic!I went snorkelling on the reef offshore this morning and it was the most fantastic thing I have ever doneSeeing such extraordinary beauty,I think every cell in my body woke up.It was like discovering a whole new dimension of life.栏目
16、导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seawith a cold drink in my hand 是“with宾语宾语补足语”结构。此处的宾语补足语是介词短语 in my hand。I have ever done 是定语从句，修饰先行词 the most fantastic thing。先行词被形容词最高级修饰时，定语从句的引导词宜用that。此处 that 在从句中作宾语，已被省略。现在分词短语 Seeing such extraordinary beauty 作状语。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯
17、关自学导引语篇理解Unit 3 Under the seaThe first thing I became aware of was all the vividcolours surrounding mepurples,reds,oranges,yellows,blues and greens.The corals were fantasticthey were shaped like fans,plates,brains,lace,mushrooms,the branches of trees and the horns of deer.And all kinds of small,neat
18、 and elegant fish were swimming in and around the corals.I became aware of是省略了引导词that(不宜用which)的定语从句，修饰 The first thing。现在分词短语 surrounding me 作定语，修饰 colours。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaThe fish didnt seem to mind me swimming among them.I especially loved the little orange
19、 and white fish that hid in the waving long thin seaweed.And I also loved the small fish that clean the bodies of larger fishI even saw them get inside their mouths and clean their teeth!It seemed there was a surprise waiting for me around every corner as I explored small caves,shelves and narrow pa
20、ssages with my underwater flashlight：the yellow and green parrotfish was hanging upside down，栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaand sucking tiny plants off the coral with its hard bird-like mouth;a yellowspotted21 red sea-slug22 was sliding by a blue seastar;a large wise-looking
21、23 turtle24 was passing so close to me that I could have touched it.that hid in the waving.和 that clean the bodies.均是 that 引导的定语从句。waiting for me 为现在分词短语作定语，修饰 a surprise;as I explored.为 as 引导的时间状语从句。so.that 引导结果状语从句。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaThere were other creatures
22、that I didnt want to get too close toan eel25 with its strong sharp26 teeth，with only its head showing from a hole,watching for a tasty27 fish(or my tasty toe！);and the giant28 clam29 half buried in some coral waiting for something to swim in between30 its thick green lips.Then there were two grey31
23、 reef sharks,each about one and a half metres long,which suddenly appeared from behind some coral.I told myself they werent dangerous but that didnt stop me from feeling scared to death32 for a moment!栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seathat I didnt want to.是 that 引导的定语从句，修饰 othe
24、r creatures。with only its head showing from a hole 是 with 复合结构，在句中作伴随状语；现在分词短语 watching for.作 showing from a hole 的状语，对其加以补充和说明。which 引导非限制性定语从句，which 指代 two grey reef sharks。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaThe water was quite shallow33 but where the reef ended,there was a st
25、eep34 drop to the sandy ocean floor.It marked a boundary35 and I thought I was very brave when I swam over the edge of the reef and hung there looking down into the depths of the ocean.My heart was beating wildly36 I felt very exposed in37 such deep clear water.栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Un
26、it 3 Under the seawhere the reef ended 是 where 引导的地点状语从句。where意为“在某个地方”。现在分词短语 looking down into the depths of the ocean 作伴随状语。What a wonderful,limitless38 world it was down there!And what a tiny spot I was in this enormous world!两个 what 引起的感叹句加强感情色彩。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under
27、the sea崭新的生活空间1 月 19 日我坐在温暖的夜空下，手里拿着一瓶冷饮，回忆着当天的事情这纯粹是神奇的一天！这天上午，我戴着呼吸器在近海的珊瑚礁上潜泳，这是我从来没有过的绝妙经历。看到这样奇特的美景，我体内的每个细胞都苏醒了，就像发现了一个全新的生活空间似的。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea我首先注意到的是我周围那些鲜艳的色彩紫色、红色、橘黄、明黄、蓝色和绿色。那些珊瑚都是稀奇古怪的有的形状像扇子、盘子、脑袋和彩带，有的像蘑菇、树枝和鹿角。还有种类繁多、小巧整齐、姿态优雅的鱼穿行在珊瑚丛中，或环游于珊瑚的
28、四周。我在这些鱼群中游泳，它们似乎并不在乎。我特别喜欢那些橘黄和白色相间的小鱼，它们藏在波动着的细长的海藻里。我也喜欢那些为大鱼清洁身体的小鱼我甚至还看到这些小栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea鱼游进大鱼的嘴里去帮它们清洁牙齿！当我用水下探照灯探索小石洞、暗礁和狭窄通道的时候，似乎每个角落都有使我感到惊奇的东西等着我：黄绿相间的鹦嘴鱼倒挂着，用它那像鸟嘴一样的硬嘴从珊瑚上吮吸微小植物；一条带着黄斑点的红色海蛞蝓从一个蓝色的海星旁边滑行过去；一只长相聪慧的大海龟紧贴我的身旁而过，我伸手便可触及。栏目导引教材助读解疑清障
29、要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea还有一些其他的动物，我不想太靠近它们一条带有利齿的海鳗，只是把头从洞里伸出来，望着可作美餐的鱼过来(或者在等着我的美味脚趾伸过去！)；那个巨大的蛤蜊半掩在珊瑚礁中等着有什么东西游过来，游到它那宽厚的绿嘴唇中去。然后，有两条灰色的礁鲨，每条大约有 1.5 米长，突然从珊瑚后边游了出来。我告诉自己它们并不危险，但是这样一点也不能抑制我那怕得要死的心情！栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea水很浅，但是到了珊瑚礁的尽头，就有一个陡坡，一直下
30、降到满是沙子的海底。这是边界的标志。我游过珊瑚礁的边沿，浮在上面往下看海底的时候，我认为我还是非常勇敢的。我的心急剧地跳动着在这样深邃而清澈的海水中，我感觉我彻底曝光了。这个水底下的世界是多么美妙，多么漫无边际！而我在这个海洋的世界中又是多么渺小！栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seareflect vi.思考 vt.映射；反射；思考(教材 P24)Im sitting in the warm night air with a cold drink in my hand and reflecting on the day
31、a day of pure magic!我坐在温暖的夜空下，手里拿着一瓶冷饮，回忆着当天的事情这纯粹是神奇的一天！栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea(1)reflect on/upon sth.思考某事(2)reflection n 反射；反照；反映；映像；认真思考 be lost in reflection 陷入深思中It reflects a trend that nowadays teenagers care more about their phones instead of friends.这反映了当今青少
32、年更关心手机而不是朋友的趋势。When the suns rays hit the earth，a lot of heat is reflectedback into space.太阳光照射到地球时，大量的热被反射回空中。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea即学即练单句语法填空(2019江苏卷)A city is the product of the human hand and mind，_(reflect)mans intelligence and creativity.Usually a childs behav
33、iour is a _(reflect)of his family environment.You should set aside some time to reflect _ your successes and failures.reflectingreflectionon栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea能力提升微写作(2019江苏卷)此外，中国传统的衣服不能反映我们学校的独特文化。What s more，the traditional Chinese dress can t _reflect the uni
34、que culture of our school栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seabe/become aware of 对知道、明白；意识到(教材 P24)The first thing I became aware of was all the vivid colours surrounding mepurples,reds,oranges,yellows,blues and greens.我首先注意到的是我周围那些鲜艳的色彩紫色、红色、橘黄、明黄、蓝色和绿色。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松
35、闯关自学导引语篇理解Unit 3 Under the sea(1)be aware that 知道；体会到 make sb.aware of/that.使某人注意到 as far as Im aware 据我所知(2)raise/arouse ones awareness of 提高某人的意识When visiting another country,you should be aware of those differences and respect them.当你拜访另一个国家时，你应该意识到这些差异并尊重它们。What he had said made me aware ofmy ow
36、n shortcomings.他所说的话使我意识到了我自己的缺点。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea即学即练单句语法填空(2019北京卷)Earth Day,marked on 22 April,is an annual event aiming to raise public _(aware)about environmental protection.awarenessare aware of能力提升词汇升级(普通表达)Through the activity,we realize the importance
37、of carrying out a low carbon economy in our country.(高 级 表 达)Through the activity,we_the importance of carrying out a low carbon economy in our country.栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seanarrow adj.狭窄的；有限的；狭隘的 v缩小(经典例句)Parents and children should communicate more to narrow the g
38、ap between them so that they can understand each other better.父母和孩子应该多沟通交流，缩小彼此之间的代沟，以便能够更好地理解彼此。(1)a narrow victory 险胜 a narrow escape 死里逃生(2)narrowminded adj.心胸狭窄的 narrowly adv.仔细地；勉强地栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaAs far as I know,the girl has a very narrow view of the wo
39、rld.就我所知，这个女孩对世界的认识是非常狭隘的。He won a narrow victory in the election.他在竞选中险胜。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea即学即练单句语法填空It is said that he _(narrow)escaped being killed in the traffic accident the other day.He congratulated himself on having made a _(narrowly)escape from death.na
40、rrowlynarrow栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea能力提升微写作当地政府为缩小贫富差距做出了很大的努力，并已达到预期的目标。The local government _between the rich and the poor,and has already achieved the intended target.has made great efforts to narrow the gap栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seash
41、arp adj.锐利的；锋利的；敏捷的；(数量的上升或下降)急剧的(经典例句)I felt sharp pain in my back,which made my parents very worried.我感觉后背剧烈地疼痛，这使我的父母很担心。(1)have a sharp mind/brain有敏锐的头脑 have a sharp eye/ear/nose for对有灵敏的视力/听力/嗅觉(2)sharpen vt.磨快；使锐利 sharply adv.急剧地；严厉地；苛刻地 栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea
42、The knife,which is very sharp,belongs to Tom.这把锋利的刀子是属于汤姆的。Mary has a clear and sharp mind.Besides，she has a talent for drawing and singing.玛丽思维清晰敏捷。此外，她还有画画和唱歌的天赋。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea即学即练单句语法填空/猜测加黑词的含义 The program will give young athletes the chance to _(sharp)t
43、heir skills.From 2005 to 2014,the total number of private cars in China rose _(sharp)from 32 million to 154 million.Ever since last year,there has been a sharp increase in house prices._sharpensharply(数量的上升或下降)急剧的栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seascare vt.恐吓 vi.受惊吓 n惊吓，恐慌，恐惧(经典
44、例句)It scared me to think I was alone in the building.想到楼里只有我一个人，挺害怕的。(1)scare.away/off 把吓跑/吓退(2)scaring adj.令人害怕的；吓人的(3)scared adj.受惊吓的；感到害怕的 be scared to do.不敢做 be scared to death 吓死了栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea(2019全国卷)The gun shots had scared the dog off.枪声把狗吓跑了。When t
45、he girl saw the long snake,she was scared to death.当这个女孩看到这条长长的蛇时，她吓得要死。scaredscaringscared即学即练单句语法填空I felt _(scare)to death after hearing the shocking news from him.Making changes can be a _(scare)experience.She was _(scare)when she found a very fierce dog.栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3
46、 Under the seawith复合结构(教材 P24)Im sitting in the warm night air with a cold drink in my hand and reflecting on the daya day of pure magic!我坐在温暖的夜空下，手里拿着一瓶冷饮，回忆着当天的事情这纯粹是神奇的一天！with 复合结构在句中常作状语，表示原因、方式、时间、伴随等，其构成是：栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seawithn.adj./adv.介词短语to do（表将来）doin
47、g（表主动、进行）done（表被动、完成）With so many lessons to go over,youd better stay at home during this holiday.有那么多的功课要复习，这个假期你最好待在家里。With nothing left to burn,the fire became weak and finally died out.没有东西可烧，火变弱了，终于熄灭了。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea即学即练单句语法填空With the beautiful dress sh
48、e liked _(buy),Lucy went home happily.The boby usually sleeps with the light _(2019江苏卷)Chinas image is improving steadily,with more countries_(recognize)itsrole in international affairs.boughtonrecognizing栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea能力提升句式升级(普通表达)I have an important meeti
49、ng to attend,so I cant go to the cinema with you.(高级表达)_,I cant go to the cinema with you.(with 复合结构)With an important meeting to attend栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seawhere 引导地点状语从句(教材 P24)The water was quite shallow but where the reef ended,there was a steep drop to the san
50、dy ocean floor.水很浅，但是到了珊瑚礁的尽头，就有一个陡坡，一直下降到满是沙子的海底。(1)从属连词 where 引导地点状语从句；(2)wherever“在何处；无论何处”也可以引导地点状语从句。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the seaAs the old saying goes，where there is a will，there is a way.常言道：“有志者，事竟成。”As far as Im concerned,you are free to go where you like.就我个人而言，
51、你愿意去哪里就去哪里。栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea能力提升一句多译很多高楼在一年前还是废墟的地方拔地而起。A number of high buildings have arisen _a year ago but ruins.(状语从句)A number of high buildings have arisen _ a year ago but ruins.(定语从句)where there was nothingin the place where there was nothing栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea栏目导引教材助读解疑清障要点透析讲练互动知能演练轻松闯关自学导引语篇理解Unit 3 Under the sea本部分内容讲解结束 按ESC键退出全屏播放