您要查找的是不是：
- 徒勞futile
- 無力的languid
- 徒勞的infructuous
- 無力地feebly
- 無力償還insolvency
- 重症肌無力myasthenia gravis
- 結果證明這隻不過是一場徒勞。It turned out to be a wild-goose chase.
- 演講和抗議全都徒勞。Speeches and protests were of no avail.
- 全身無力general weakness
- 我一直要基思整理自己的房間，但看來我這樣做是徒勞的。I keep trying to get Keith to tidy his room but I'm fighting a losing battle.
- 該國無力抵抗侵略。The nation was unable to resist the invasion.
- 無力感dilutedness
- 沒有土壤，播種也是徒勞。It is lost labour to sow where there is no soil.
- 他的演說無力。His speech lacked punch.
- 使某人徒勞nullify one's efforts
- 四肢無力weakness of limbs
- 我們的努力全是徒勞。Our efforts were in vain.
- 渾身無力weak all over
- 反對這些規定是徒勞的。It's no use kicking against the rules.
- 肌無力myasthenia
