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1·He shouted after them, vainly trying to attract their attention.

他在他们的后面高喊，想引起他们的注意，却是徒劳。《牛津词典》

2·He hunted vainly through his pockets for a piece of paper.

他徒劳地摸索着自己的口袋想找到一张纸。《柯林斯英汉双解大词典》

3·The criminals vainly sought concealment from the searchlight.

罪犯们试图躲开探照灯光，纯属徒劳。《柯林斯英汉双解大词典》

4·He then set out for Virginia for what he vainly hoped would be a peaceful retirement.

于是他出发前往弗吉尼亚，徒然地希望这会是一次平静的引退。《柯林斯英汉双解大词典》

5·He vainly hope to travel round the world on foot.

他梦想步行周游世界。《新英汉大辞典》

6·Vainly I cry, I do not know you.

我徒然地叫道：“我不认识你们。”

7·For while the tired waves, vainly breaking.

因为疲惫的波浪，徒然地破碎时。

8·We struggle vainly, fighting to solve the problem.

我们徒劳地斗争着，为解决问题而拼搏。

9·They vainly tried to find out the stranger's name.

他们想查出那陌生人的姓名，却徒劳无功。

10·He took off after me, vainly trying to land a blow.

他在后面紧追不舍，总想打到我。