friction is a force that always acts an opposition movement
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friction is a force that always acts an opposition movement
opposition movement又是什么?
opposition movement又是什么?
![friction is a force that always acts an opposition movement](/uploads/image/z/6363699-51-9.jpg?t=friction+is+a+force+that+always+acts+an+opposition+movement)
act 起作用
opposition movement 反方向运动
摩擦力是一种总是向运动的相反方向起作用的力
opposition movement 反方向运动
摩擦力是一种总是向运动的相反方向起作用的力
friction is a force that always acts an opposition movement
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