A force is the push or a pull on the object. A force changes the motion of a moving obj...
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懂你英语Level4-Unit1 2/4 Vocabulary
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懂你英语 Level 4 - Unit 1
1/4 Listening 2017-07-03 13:04:01 2017-07-03 13:57:10 53 minutes 441 words 8.23w/m Chri...
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懂你英语 Level 3 - Unit 3
1/4 Listening There are many forms of life on Earth, including human beings.Live exists...
