underscore

音标发音

I want to underscore the importance of this decision.
我要强调这份决议的重要性。
Default the value to an underscore ("_"); you can use any value here.
默认值为一个下划线 ("_")；这里可以使用任意值。
By default, it matches only sequences of "keyword" characters (alphanumerics and underscore), and it has no deep sense of context beyond matching what’s immediately to the left of the cursor.
默认情况下，它仅匹配 “关键字” 字符序列（数字、字母和下划线），除了与光标左边进行匹配之外，它对上下文没有深刻的理解。

These are students who felt under enormous pressure to perform, and I want to underscore the word 'perform,' as opposed to 'learn.'" She says the hardest lesson for society may be that young people will grow up lacking interest in learning.
- Now the bottom-- the little underscore in the bottom right hand corner represents the blank tile and just as with my thumbs I would move 4 down or maybe 2 to the right.
现在下方,右下方的下划线表示空白片,我可以用手指将4移下来,或者将2移到右边。
哈佛公开课 - 计算机科学课程节选
In any way, this story helps to underscore some important differences between Plato and Aristotle.
但这个故事的确,深刻地强调了一些重要的,介于柏拉图与亚里士多德之间的差别。
耶鲁公开课 - 政治哲学导论课程节选

But it should underscore how frequently media reporting and economic reality are often miles apart.
FORBES: Hiring . . . Chicken or Egg?

to underline
the character _ on a computer keyboard, used to draw a line under a letter or word, and also used in file names where a space is not allowed

If something such as an action or an event underscores another, it draws attention to the other thing and emphasizes its importance.
If you underscore something such as a word or a sentence, you draw a line underneath it in order to make people notice it or give it extra importance.