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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The larvae prey upon small aphids.

这种幼虫以小蚜虫为食。

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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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It seemed to me also that every living African, whether in good or ill health, is prey to many enemies of health that would interact one upon the other in many ways within one human body, Critics feared if President Mbeki appeared to doubt the link between HIV and the disease, people would not practice safe sex and use condoms.

VOA: standard.2010.05.17

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

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This open-ended or unlimited fee structure is common among broker-consultants at the large wirehouses who tend to prey upon smaller funds.

FORBES: Compelling Pension Consultant Disclosure (June 1, 2002 )

Unfortunately, politicians are too quick to demonize technology companies and prey upon public fears, and this places revolutionary companies like Facebook in the eye of the storm.

FORBES: Facebook Status Update - New Privacy Controls