There are three signs of senility. The first sign is that a man forgets his theorems. The second sign is that he forgets to zip up. The third sign is that he forgets to zip down.
衰老有三个迹象。第一个迹象是一个人忘记了他的定理。第二个迹象是他忘记拉上拉链。第三个迹象是他忘记拉下拉链。
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Forget
Sign