下落物体在下落过程中获得动量。

A falling object gains ___momentum as it falls.

球员们在比赛中途开始失去势头。

The players began to lose ___momentum halfway through the game.

技术似乎创造了自身的势头——如果某事能做，它就会被做。

Technology seems to create its own ___momentum – if something can be done, it will be.