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The macaco doesn't climb up the acacia tree two times.

马科树不会两次爬上金合欢树。

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During this time I had the singular good fortune of being able to discuss the problem constantly with Einstein. Some experiments done at Einstein's suggestion yielded no decisively new result.

在这段时间里，我有幸能够不断地与爱因斯坦讨论这个问题。按照爱因斯坦的建议所做的一些实验并没有产生决定性的新结果。

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Coal research and development provides huge benefits for the nation, and pay for itself many times over through taxes flowing back to the Treasury from expanded economic activity.

煤炭研究和开发为国家提供了巨大的利益，并通过从扩大的经济活动中回流到财政部的税收为自己支付了许多倍。

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