所以，表示饲养食用动物，如公牛，母牛，羊和猪时，我们使用了古英语的单词；而像牛肉，羊肉，猪肉和熏猪肉这些人们吃的肉类的单词却源于法语。

So, the words we use for most animals raised for food, such as ox, cow, sheep and pig, come from old English, while the words for the meat people eat come from French: beef, mutton, pork and bacon.

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他们发现他养了很多羊、猪和牛。

They found he had a lot of sheep, pigs and cows.

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首先，所有的动物，如牛、猪和羊，总是排出石灰甲烷气体，这是继二氧化碳之后第二常见的温室气体。

For a start, all animals, such as cows, pigs and sheep, always gas limed methane, which is the second most common green house gas after carbon dioxide.

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