要种植一公斤的蔬果，耗水量2 000公升，但要养育出一公斤的牛肉，耗水量高达15 000公升，而且大众吃肉越吃越多。

It takes 2, 000 litres (530 American gallons) of water to grow a kilo (2.2lb) of vegetables but 15, 000 litres to produce a kilo of beef—and people are eating more meat.

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不是让自然选择和养育那些最成功的标本，人类却自己开始选择、养育和种植那些最迎合他们的东西。

Instead of nature choosing and breeding the most successful specimens in the wild, humans started to choose, breed and grow those that suited them best.

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然后，一些人学会了如何种植庄稼和养育动物为食物，他们也就成了农民。

Then, some people learned to grow crops and raise animals for food. They were the first farmers.

youdao

然后，一些人学会了如何种植庄稼和养育动物为食物，他们也就成了农民。

Then, some people learned to grow crops and raise animals for food. They were the first farmers.

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