Note the underlining of the validity error.

注意打了下划线的有效性错误。

The hot keys are indicated by underlining in the control labels.

这些热键由控件标签中的下划线指示。

Keep the red color, but get rid of the underlining and hover state.

保持红色不变，但去除下划线和悬浮状态。

Don't use underlining - underlining looks like a hyperlink to a website.

不要用下划线，因为看起来像一个网址。

BASE metal, The underlining metal to which alloying agents or metals are added.

基底金属，指合金中的主要金属成份。