副詞 vainly:

1. to no avail
   同義詞：in vain

1. He vainly tried to mark the defacing stain out.
   他試圖除去有損外觀的污跡，但沒有成功。
2. Before they fled the country, the enemy vainly attempted to destroy all the factories.
   敵人在逃往國外前，妄圖把所有工廠都毀掉。
3. Taking just a little money with her, she wanders about the Midland moors, vainly seeking employment.
   她身上僅帶了少許的錢，在英格蘭中部荒原上四處漂泊徒勞地求職。