zsh 操作符 $= 在空白边界处拆分单词。

The zsh operator, $=, splits words at whitespace boundaries.

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需要遍历该列表，将每个单词拆分为经过排序的字母数组，然后再次合并数组。

You want to iterate through the list, breaking each word into a sorted array of letters, then joining the array again.

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若要 tokenize（也就是说，将一行拆分为单词长度的片段）某个字符串，请使用 split() 函数。

To tokenize (that is, split a line into word-length pieces) a string, use the split() function.

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