Effective"
例句
全部effectivevalidefficaciousavailabilitybe good for
1.
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》
Effective"
例句
全部effectivevalidefficaciousavailabilitybe good for
1.
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》