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都是出卖,卖给中原各国也可以,何必非要卖给越国呢? 
The mathematics of the universe is written in the language of geometry.
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
Innovation is not just about new ideas; it's about executing them effectively.
当没有人相信你时,你必须相信自己。
The only thing that really matters is, are you a good person?