A macro variable is expanded "in place" to yield a text string that may then be expanded further.

宏变量会被“就地”扩展，其所产生的文本字符串还可以进一步的扩展。

youdao

A macro variable is expanded "in place" to yield a text string that may then be expanded further.

宏变量会被“就地”扩展，其所产生的文本字符串还可以进一步的扩展。

youdao