The first billiard ball could move without the second one moving, right, there is no necessary connection between them then.

在第二个球不动的情况下第一个球还是能动的，对吧，他们之间并没有必然的切合点。

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Ok,so we see one billiard ball moving towards another and impact with the second one.

我们看到某台球朝另一台球运动,并发生了撞击。

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One of the lenses is a first lens with a high number of pixels for photographing a still image, and the other lens is a second lens for photographing a moving image.

镜头的一个是一个像素的静态图像拍摄大量的第一只镜头，另一个镜头是拍摄动态影像秒镜头。

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He discovered that galaxies are moving away from Earth at speeds between three hundred kilometers a second and one thousand eight hundred kilometers a second.

VOA: special.2009.04.29

The Bruins fell to 5-2 in their last seven games one night after moving into second place in the East with a 5-4 win at New Jersey.

WSJ: Bailey scores twice as Islanders top Bruins 2-1

Some feature pistons with a second piston moving in the first one.

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One moment you are in a chess app moving pawn to K4 and the next second you find that you have accidentally clicked on one of these banners and have been directed to the app store.

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