底线的英文：
underline

参考例句：

Baseline Ball
底线球

That is my bottom line.
这是我的底线.

The bobbin thread tension is too high.
底线张力过强。

Adjusting the bobbin thread tension
底线张力的调节

You have to know what's what and when to draw the line.
你必须搞清实质以及自己的底线。

A minimum wage,ie guaranteed basic pay in a particular industry or country
最低工资(某行业或某国的工资底线)

The crowd yelled when the hometown team scored a touchdown
当他们自己的队得了底线分时,人群高声呼喊起来。

Time ran out before we could score another touch down.
我们没来得及再一次底线得分，时间就到了。

The bottom line is you're going to lose time.
底线就是你肯定得花费一些时间。

To be successful, nonprofits have to manage both bottom lines simultaneously.
非盈利组织需要同时管理这两个底线才能获取成功。

underline是什么意思：
v. 在…下面划线；强调
n. 下划线；下期节目预告

There are dozens of words and phrases underlined.
有许多单词和短语的下面划了线。

You'll see the underline on the top.
你会在最上面看到下期节目预告。

The rice crisis underlined an embarrassing problem that the government faces.
大米危机使政府面临的困窘问题更为突出。

The frantic bombing only underlined the weakness of the enemy.
疯狂的轰炸只显示出敌人的虚弱。

Pressing alt plus the underlined letter in the menu.
按更改键Alt和菜单中带下划线的字母。