我们知道，这几乎是弹性碰撞，它以同样速度回来。

And we all know that if it is a nearly elastic collision that it comes back with the same velocity.

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8月04日刊登在“自然”杂志上的一项新的研究表明，内脏折叠的式样取决于内脏、肌肉以及附加在上面所有东西的弹性、几乎形状和生长的速度。

A new study published Aug 4 in the journal Nature found that the patterns of this fold depend on the elasticity, geometry and rate of growth of the gut and the muscles it's anchored to.

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你看这些质量是否相等,这里是弹性碰撞，它静止，它以v2’运动，它的速度是。

You will see if the masses are the same and there is an elastic collision, this one will stand still and this one, v2 prime, v1 will have a velocity v1.

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