名詞 underline:

1. a line drawn underneath (especially under written matter)
   同義詞：underscore

動詞 underline:

1. give extra weight to (a communication)
   同義詞：underscore, emphasize, emphasise
2. draw a line or lines underneath to call attention to
   同義詞：underscore

1. In word processing, a facility to automatically underline text.
   在字(詞)處理技術中，自動在正文下面劃線的一種設施
2. Those words are underlined in the English book.
   那本英語書中有些單詞下畫著線進行強調(diào)。
3. Strikes by prison officers underline the need for reform in our gaols.
   監(jiān)獄工作人員罷工一事，突出地表明我們的監(jiān)獄制度需要改革。