1、If spare no endeavor in promotion, nothing will be in vain.的意思是:
如果不遗余力的去努力提升,什么都不会是徒劳的。
2、spare no endeavor不遗余力的努力,不惜一切努力
例句:We spare no endeavor in endeavoring to be of service to you.
我方将不遗余力为贵方效劳。
promotion 提升;促进;晋升;促销
例句:There are good chances of promotion in this firm.
这家公司里提升的机会很多。
in vain 徒然;无效
例句:Our efforts were not in vain.; We didn't waste our energy.
我们的力气没有白费。
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