Science A force is a push or a pull on an object. 力是对物体的推或拉。 A force changes the motion...
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英语流利说 Level4 Unit1 Part2 -Science&Geometry
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英语流利说 Level3 Unit3 Part3 - Good News & Bad News
Good News & Bad News 好消息和坏消息 Hey, I’ve got some news, some good news and some bad news....