vainly
adv. 徒劳地
近义词：invain，unsuccessfully，ineffectively，hopelessly，uselessly，
英英释义
Adverb
- to no avail;
"he looked for her in vain" "the city fathers tried vainly to find a solution"
例句
用作副词(adv.)
- He had tried vainly and lost his heart at last.他徒劳地尝试，终于失去了信心。
- We struggle vainly, fighting to solve the problem.我们徒劳地斗争着，为解决问题而拼搏。