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In times of difficulty, friendship is on trial.

患难见真情。

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About seven years later I was given a book about the periodic table of the elements. For the first time I saw the elegance of scientific theory and its predictive power.

大约七年后，我得到了一本关于元素周期表的书。我第一次看到了科学理论的优雅及其预测能力。

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There was a time when country never used to do videos.

有一段时间，国家从来没有做过视频。

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