Scientists have found that cows are very social animals and a cow always makes friends with other cows.

科学家们发现，牛是一种非常合群的动物，一头牛总是和其他牛交朋友。

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He played the qixianqin very well and the music was beautiful, but the cow showed no reaction at all.

他把七弦琴弹得很好，音乐也很动听，但牛却毫无反应。

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It can be very convenient for you to have milk for yourself. And the cow will also give you some whey that you can use for cooking; everything will be convenient.

我们有一头牛可以供养你，这样一来你要获取牛奶就很方便了，而且牛奶中的乳清也可以拿来煮菜，一切都会很方便的。

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She was a milkmaid. She had to get up very early every morning and go to the barn to milk the cow.

VOA: special.2010.11.20

It's a big change in some of these very poor villages to get a cow.

奶牛对这些赤贫的村庄来说可是生财之道

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"For large animals like beef, a very large fraction of the nitrogen that enters the cow's mouth is excreted out the back end."

VOA: special.2011.04.05

Again, these are cash-cow entities, very little maintenance required.

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They're not looking very hard for mad cow disease, and so they're not finding it very often.

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The current wave of viral panic is of course the most recent chapter in a very long history of epidemics: Ebola in the 1990s, mad cow disease in the 1980s, polio in the 1930s and 1940s, the black death in the 14th century, and so on.

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