英语有效词

Effective"例句全部effectivevalidefficaciousavailabilitybe good for1.这张车票3日内有效。This train ticket is valid for three days.《汉英大词典》2.你如果能正确和有效地使用一个字，你就了解它了。If you can use a word correctly and effectively, you comprehend it.《汉英大词典》

有效 英语 valid

useful