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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You must also make sure to ignore the characters only if they appear at the first of the string.

还要保证只有出现在字符串开始位置的字符才能忽略。

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You must also make sure to ignore the characters only if they appear at the first of the string.

还要保证只有出现在字符串开始位置的字符才能忽略。

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