If you apply underlining to a superscript text, the underlining is raised to the level of the superscript. If the superscript is contained in a word with normal text, the underlining is not raised.
如果为上标文字加下划线，下划线将升高以与上标文字匹配。如果为上标文字和普通文字一起加下划线，下划线则不会升高。