If one has to jump a stream and knows how wide it is, he will not jump. If he does not know how wide it is, he will jump, and six times out of ten he will make it.
如果一个人必须跳过一条小溪,并且知道它有多宽,他就不会跳。如果他不知道它有多宽,他会跳下去,十有六次他会成功。
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