If these great cats become extinct, the smaller animals they prey upon will overpopulate the forests.

如果这些大型猫科动物灭绝了，那么它们捕食的小型动物将会使森林中物种的密度过高。

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Stronger animals prey upon weaker ones.

强大的动物捕食弱小的动物。

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The Internet can be full of dark, scary people who prey upon people's naivety and innocence.

互联网上可能充斥着各种阴森恐怖的人，他们专门利用人们的天真无邪。

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Let that be understood by those who practice terrorism and prey upon their neighbors.

CNN: Inaugural Address

Almost all of these guys are retail brokers dressed up and sent out into the world to prey upon pensions.

FORBES: The Art of Theft: How Corporate Fiduciaries Steal From American��s Pensions (February 2, 2005 )

Desperate people are willing to do almost anything when catastrophe strikes and these scamsters prey upon them like buzzards.

FORBES: Hurricane Sandy Will Flood Northeast with Disaster Scams: How to Avoid Them