预习 新知早知道UNIT 4 SPACE EXPLORATIONmentalintelligentlackdeterminelaunchattachdisappointeddesireotherwisesignalprocedureastronautgravitylaunchedMankindmonitoredagencydatacurrentorbitMentallymicrowaveuniversaldeterminationdisappointmentindependentlyregularlyargumentgloballimited登上一大步随之而来的是谢谢观看 THANK YOU!