1、back up

支持，证实（某种说法）

Radio signals received from the galaxy's centre back up the black hole theory.

从该星系中心收到的无线电信号证实了黑洞理论。

Her views are backed up by a 1989 Home Office report on crime.

1989年内政部的一份犯罪报告印证了她的观点。

备份（文件）

Make a point of backing up your files at regular intervals.

一定要定期备份文件。

I get so annoyed when I lose work because I've forgotten to back it up.

当我因为忘了备份把完成的工作弄丢时，真是懊恼极了。

将…付诸实施

The Secretary General says the declaration must now be backed up by concrete and effective actions.

秘书长说现在必须将宣言付诸具体有效的行动。

It is time the Government backed up its advert campaigns with tougher measures.

是政府采取更严厉的措施来兑现其宣传承诺的时候了。

（车辆）堵塞，排成长龙

Traffic into London on the M11 was backed up for several miles.

进入伦敦的车辆在11号高速公路上堵了好几英里。

2、come on

(表示鼓励)来吧

Come on Doreen, let's dance.

来吧，多琳，我们跳舞吧。

得了吧;算了吧

'Have you said all this to the police?' — 'Aw, come on!'

“你是不是把这些都告诉警方了？”“呀，怎么会呢！”

Come on, Sue, that was two years ago.

得了吧，休，那是两年前。

进展;进步

Lee is coming on very well now and it's a matter of deciding how to fit him into the team.

李现在进步很大，问题是如何在队里给他找一个合适的位置。

The knee's coming on fine, I'm walking comfortably already.

膝盖恢复得很好，我现在走路已经不疼了。

(机器或系统)开始工作，开始运转

The central heating was coming on and the ancient wooden boards creaked.

中央供暖系统开始工作，弄得那些老掉牙的木板嘎吱作响。