The second language is a macro language for performing textual substitution.
第二种语言是宏语言，用来进行文字的转换。
Textual substitution can get very messy when used in combination with other expressions.
文本替换在与其他表达式一起使用时，可能会变得非常混乱。
Textual substitution is a useful, but fairly limited feature. This feature has these problems.
文本替换是一种有效但是却非常有限的特性。
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