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There is only one boss. The customer. And he can fire everybody in the company from the chairman on down, simply by spending his money somewhere else.
Natural experiments can provide valuable insights into economic questions.
如果你不参与,你就无法获胜。
可持续发展不仅仅是保护树木;它关乎确保自然和人类共同繁荣的未来。
The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.