During college, good grades made you happy, but it was short-lived.

上大学期间，考试得了高分让你无比开心，但这种幸福感毕竟是短暂的。

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I hope that good grades can become permanent, and not short.

我希望这好的成绩能变成永久，而不是短暂的。

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I hope that good grades can become permanent, and not short.

我希望这好的成绩能变成永久，而不是短暂的。

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