The rebels backed up their demands with threats.

反叛者以恐吓手段要挟。

《牛津词典》

I backed up carefully until I felt the wall against my back.

我小心翼翼地后退了几步，直到感觉到后背贴上了墙。

《柯林斯英汉双解大词典》

These front-line defences are backed up by armoured units in reserve.

前线防御有后备装甲部队的支援。

《柯林斯英汉双解大词典》

The New York State Thruway has been backed up all the way from the George Washington Bridge.

VOA: special.2009.08.10

And Rutherford, who I have already described to you as being a little bit colorful in his language, backed up Bohr on this.

而卢瑟福，就是以前我跟你们提过的那个,语言丰富生动的人，在这一点上证实了波尔的理论。

麻省理工公开课 - 固态化学导论课程节选

We're talking about like, if you didn't, even if you had all your data on your computer backed up on hard drive,

如果你没有将你电脑里的数据备份到硬盘里，

没有智能手机活不了 - SpeakingMax英语口语达人

All cash donations have to be backed up by a record under the new law.

FORBES: Cutting Taxes While Doing Good

This would be backed up by a larger Council with equal representation for doctors and patients.

BBC: GMC outlines reform plans

LeMond's account is backed up by a veteran cycling photographer and journalist named James Startt.

NPR: Ex-Friends Say Armstrong Admitted Drug Use