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1·There is no emergency back-up immediately available.

没有立即就能获得的后备。《柯林斯英汉双解大词典》

2·As a result, they have lost the parachute they once had in times of financial setback—a back-up earner (usually Mom) who could go into the workforce if the primary earner got laid off or fell sick.

因此，它们已经失去了在经济萧条时期曾经持有的“保护伞”——一个后备挣钱者（通常是母亲），她可以在主要挣钱者失业或者病倒的时候出去工作。

3·Homes lacked back-up power generators.

家里也没有备用的发电机。

4·You can back up another two feet or so.

你可以再退两英尺左右。《牛津词典》

5·That sort of attitude really gets my back up!

那种态度实在叫我恼火！《牛津词典》

6·She invoked several eminent scholars to back up her argument.

她援引了几位赫赫有名的学者来支持她的论点。《牛津词典》

7·He's now back up on the slopes again, skiing competitively in events for the disabled.

他如今又回到了滑坡上，在残疾人赛事上赛滑雪。《柯林斯英汉双解大词典》

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

从该星系中心接收到的无线电信号证实了黑洞理论。《柯林斯英汉双解大词典》

9·The writer doesn't back up his opinions with examples.

作者不用实例印证他的看法。《牛津词典》

10·Other actions can be taken to back up the policy.

可以采取其他行动来支持该政策。

(1)backup and recovery备份与恢复

(1)backup and restore备份与还原

(1)backup system备用系统；后备系统

(1)backup roll支承辊；背辊；压辊

(1)backup copy副本；备份件

(1)backup file备份文件