如果xargs将要执行的命令包含有替换字符串，那么将使用参数替换它。

Wherever the replacement string occurs in the command you ask xargs to execute, it will be replaced by an argument.

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replace函数采用了三个参数：第一个参数是要修改的文本，第二个参数是与将要替换的部分匹配的正则表达式，第三个参数是替换字符串。

The replace function USES three arguments: the first is the text to modify, the second is the regular expression that matches the part to be replaced, and the third is the replacement string.

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