n. 有效,有用,有益;可得到的人(或物)
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1、expand
扩充;扩大;增加
Engineers noticed that the pipes were not expanding as expected.
工程师注意到管道并没有如预期那样膨胀。
The money supply expanded by 14.6 per cent in the year to September.
截至9月,当年的货币供应增加了14.6%。
扩大;发展;扩展
The popular ceramics industry expanded towards the middle of the 19th century.
到19世纪中期,大众制陶业得到了发展。
The interest rate's coming down. I'll be able to expand or stay in business.
利率正在降低,我可以扩大公司或者维持经营。
2、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。
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