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The dead are always looking down on us, they say. But we don't look back.
人们说逝者总是在俯视着我们。但我们从不回望。
可持续性不是一种选择;它是我们星球未来的必需品。
解决数学问题的喜悦是无与伦比的;这是纯粹的智力胜利的时刻。
In times of crisis, true leaders emerge by staying calm, focused and decisive.