He was vain about his looks, spending hours in the gym. 他對自己的外表很自負,在健身房裏一呆就是好幾個小時。
They made a vain attempt to protect the town from attack. 他們企圖保護這個鎮不受攻擊,結果沒有成功。
He underwent a knee operation in the vain hope of getting into the team. 他進行了膝蓋手術,徒勞地指望能進入該隊。
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