人口反弹的原因是其他人类行为的后果。
The causes of this population rebound are consequences of other human actions.
他们可以通过声波反弹的速度来判断不同物体之间的距离。
They can tell the distance of various objects by how quickly the sound waves bounce back off them.
它们还在利用全球股市反弹的机会。
They are also taking advantage of the global rebound in equities.
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