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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