Matches the underscore or underline mark.

匹配下划线标记。

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The editor will mark the validation errors with red marks on the left and right sides, and add a red wavy underline to the invalid syntax.

编辑器会左右两侧用红色标记标明验证错误，并给无效的语法加一条红色波浪型的下划线。

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If you own the book follow up with a pencil. You may want to use a very light pencil mark to underline certain words that you want to remember.

如果你使用一根铅笔读书，你可能想要用铅笔来轻轻标记某些词语来强调你想要记忆的词汇。

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