Radio signals received from the galaxy's centre back up the black hole theory. [VERB PREP. noun]

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. [VERB PREP. noun (not pronoun)]

1989年内政部的一份犯罪报告印证了她的观点。

Make a point of backing up your files at regular intervals. [VERB PREP. noun]

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. [VERB noun PREP.]

当我因为忘了备份把完成的工作弄丢时，真是懊恼极了。

The Secretary General says the declaration must now be backed up by concrete and effective actions. [be VERB-ed PREP.]

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. [VERB PREP. noun]

是政府采取更严厉的措施来兑现其宣传承诺的时候了。

His employers, Norfolk social services, backed him up. [VERB noun PREP.]

他的雇主—诺福克社会服务中心给予了他支持。

The girl denied being there, and the man backed her up. [VERB noun PREP.]

女孩否认在场，那名男子证实了她的话。

Back up, Hans. [VERB PREP.]

倒车，汉斯。

He backed up a few feet and rolled the window down. [VERB PREP.]

他往后倒了几英尺，然后摇下车窗。

A police van drove through the protesters and backed up to the front door of the house. [VERB PREP. + to]

一辆警车穿过抗议的人群，并倒至房子的前门。

Traffic into London on the M11 was backed up for several miles. [be VERB-ed PREP.]

进入伦敦的车辆在11号高速公路上堵了好几英里。

I backed up carefully until I felt the wall against my back. [VERB PREP.]

我小心翼翼地后退，直到感觉后背碰到了墙壁。

She backed up a few steps. [V P amount]

她后退了几步。