He was vain about his looks, spending hours in the gym. 他对自己的外表很自负,在健身房里一呆就是好几个小时。
They made a vain attempt to protect the town from attack. 他们企图保护这个镇不受攻击,结果没有成功。
He underwent a knee operation in the vain hope of getting into the team. 他进行了膝盖手术,徒劳地指望能进入该队。
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