The disheartened instructor tried vainly to arouse their interest .

沮丧的教师试图激起他们的兴趣，但却是徒劳。

The enemy vainly attempted destroying the bridge .

敌人妄图破坏这座桥梁。

He vainly hopes to travel around the world on foot .

他梦想步行周游世界。

Vainly broken vaccine repetition inoculates with pair of human bodies harmful ?

白破疫苗重复接种对人体有害吗？

After vainly protesting against mr putin 's victory , angry middle-class russians have turned their attention to the regions , where they hope independent candidates can create political outposts beyond the kremlin 's control .

在徒劳无功的反对普京获胜的行动之后，愤怒的中产阶级转移了注意力，寄希望于那些独立候选人建立不受克林姆林宫管制的前哨地区。