Normally they hide during the day and become active at night when they feed on human blood.

它们通常在日间隐藏起来，到晚上就出来活动，吸食人的血液。

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Even then, the penguins are cautious; they stay in the water only long enough to feed, and they're adept at remaining motionless when they're on thin ice and spot a leopard seal.

尽管如此，企鹅也十分谨慎：它们仅仅在捕食时才呆在水下；一旦意识到冰面很薄或是附近出现海豹，它们就会紧紧地趴在冰面上，一动不动。

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Black carbon is already having an impact on the ice atop the Himalayas, the massive glaciers that feed the major rivers of Asia when they melt each spring.

炭黑已经影响到喜玛拉雅山上的冰川。每当春天来到，这些冰川便融化成雪水，形成亚洲主要河流的水源。

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Scientists believe large groups of wolves became stuck when they came to feed on animals already trapped in the asphalt.

VOA: special.2010.04.07

The larvae are the main heavy feeders and they eat mainly aphids, but the fear is that when the aphids run out they feed on all sorts of other things - including the native ladybirds.

BBC: RELATED BBC SITES

The news feed is the first, and sometimes only, page people see when they log on to the Facebook website or fire up a Facebook mobile app.

CNN: Facebook revamps site, tweaks mobile apps

Resistance from local fishermen slowly turned into support when they realized they could get steady work delivering feed and materials to the farm sites while transporting harvested fish back to shore on a scheduled basis.

FORBES: Regulatory Uncertainty Drives A Fish Farmer To Foreign Waters