The team captain vainly tried to rally his troops.
队
试图振作部队的士气，但
有
。
有
果的, 无益的;The team captain vainly tried to rally his troops.
队试图振作部队的士气，但有。
The reactionary government tried vainly to take the steam out of the protest movement.
反动政府枉费心机地企图削弱这场抗议运动。
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。
The enemy vainly attempted destroying the bridge.
敌人妄图破坏这座桥梁。
He sought vainly for the answer.
他搜索枯肠, 但找不到答案。
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