A force is the push or a pull on the object. A force changes the motion of a moving obj...
IP屬地:廣東
A force is the push or a pull on the object. A force changes the motion of a moving obj...
1/4 Listening 2017-07-03 13:04:01 2017-07-03 13:57:10 53 minutes 441 words 8.23w/m Chri...
1/4 Listening There are many forms of life on Earth, including human beings.Live exists...