No, we call that work positive work. All right, so that means we need to put a negative sign right here, by convention.

历史上有过不同的习惯，这里我们规定,如果环境对系统做功。

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just like you can work as in finance no matter what, you don't need to go to college,

就好像你想在金融领域工作，你不需要什么学历，你不需要去大学，

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