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Back to this graphic again: unpredictable food supply occurred on the left but doesn't occur on the right.
再回到这张图,对左边的人而言,食物供给难以预计,而右边却并非如此
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Nutrients get broken down into several classes and these are the constituents of food that your body uses for one purpose or another.
营养素这个问题需要花几节课来讨论,它们是食物的组成要素,供给身体吸收,支持身体机能运转
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And moreover during the period of the flood they don't have food,they don't have sustenance.
而且，在洪水中，他们找不到食物,没有供给。
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You can't have slaves without wealth, because you got to feed them at the very least, and no matter how wicked a master you are, dead slaves are no good to you.
养奴隶没钱是不行的,因为不管你有多恶劣,也得供给他们生存的食物,死人是毫无用处的
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So it's very easy for people to exceed dietary recommendations given what the modern food supply is.
在现代食物供给下,人们很容易就超过了建议饮食标准
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On the left, you see somebody expending enormous physical effort to secure the food.
在左边,你能看到人们耗费大量体力,以保证食物供给
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uncertainty of the food supply and the like.
而且食物供给也不稳定
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