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Every line you draw should have a purpose, even if it's just to make someone smile.
采矿业必须发展以满足不断变化的世界的需求,否则将被淘汰。
Mental activity is the organism's dialogue with its environment.
我不知道第三次世界大战会用哪些武器,但第四次世界大战中人们肯定用的是木棍和石块。
文化是一个群体在解决外部适应和内部整合问题的过程中逐渐习得的东西。
A person must go through hard work to achieve something.