1、 For each character in the first-string,any letter that appears in the second string is replaced by the corresponding letter from the third-string.
对于第一个字符串中的每个字符，第二个字符串中的任意一个字符都由第三个字符串中相应的字母所替代。
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2、 First, string theorists have so far struggled to make new predictions that can be tested.
第一，目前为止，弦论的理论学家还没有预测可以进行的试验。
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