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。
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。
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。
When they decide to buy, an item is automatically posted on their Facebook news feed, alerting all of their Facebook friends about the deal.
他们决定购买时，一条消息会自动张贴在Facebook动态新闻上，提醒此交易的所有Facebook朋友。
Sheep are good for the land when they feed on grasses. It helps renew pastures and it can keep land from returning to forest.
如果绵羊以牧草为食的话，对牧场的耕地也有好处，它有助于翻新牧场，能够防止牧场森林化。
They feed on scraps from the table and ensure a windfall when the animal goes to slaughter, often at Chinese new year.
他们用餐桌上的残羹养猪，通常在中国农历新年时把猪送到屠宰场，发一笔小财。
They feed on scraps from the table and ensure a windfall when the animal goes to slaughter, often at Chinese new year.
他们用餐桌上的残羹养猪，通常在中国农历新年时把猪送到屠宰场，发一笔小财。
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