vainly

1.He sought vainly for the answer.

他索枯肠, 但找不到答案。

2.The enemy vainly attempted destroying the bridge.

敌破坏这座桥梁。

3.We tried vainly to discover what had happened.

我们设法想要弄清楚发生了什么事,但却徒劳。

4.The reactionary government tried vainly to take the steam out of the protest movement.

反动政府枉费心机地企削弱这场抗议运动。

5.The team captain vainly tried to rally his troops.

队长试振作部队的士气，但没有功。