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A fruit-bearing tree is known by its flowers.

结果实的树，看花而知。

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Optimism

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I came to the conclusion that the optimist thought everything good except the pessimist, and that the pessimist thought everything bad,except himself.

我得出的结论是，乐观主义者认为一切都好，除了悲观主义者，悲观主义者认为一切都坏，除了他自己。

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There are grounds for cautious optimism that we may now be near the end ofthe search for the ultimate laws of nature.

我们有理由谨慎乐观地认为，我们对自然终极规律的探索可能已经接近尾声。

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