The line is supposed to mark the minimum a person needs to feed, clothe and shelter himself.
贫困线是要确定个人生存最低的吃饭、穿衣和居住需求。
In order to survive, to feed, clothe, and shelter himself and his children, man has to learn how to use things he finds in nature, and this means that he has to study and learn about nature.
为了生存，为了自己及后代的衣、食、住，人类必须学会使用他可以从自然界得到的东西，这就意味着人类必须研究并了解自然。
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