注：randomize-lines将完全执行所期望的操作：它打乱键入的输入内容行并将它们以不同的顺序返回回来。
Note that randomize-lines does just what you would expect: It shuffles the lines of input you type in and spits them back out in a different order.
他知道下去比上来更危险，不过直到他打滑了六七次，回回又奇迹般地把自己救了回来，他才意识到这究竟有多危险。
Going down, he knew, was even more dangerous than coming up, but how dangerous he did not realize till he had slipped half a dozen times, and each time saved himself by what appeared to him a miracle.
他知道下去比上来更危险，不过直到他打滑了六七次，回回又奇迹般地把自己救了回来，他才意识到这究竟有多危险。
Going down, he knew, was even more dangerous than coming up, but how dangerous he did not realize till he had slipped half a dozen times, and each time saved himself by what appeared to him a miracle.
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