vain
adj.徒劳的；自负的；虚荣的
producing no result; having too high an opinion of oneself
例句
All attempts to contact him were vain after the conference ended.
会后所有联系他的尝试都落空了。
She spent hours choosing clothes, but it was a vain effort to impress him.
她花几小时挑衣服，却徒劳地想给他留下好印象。
怎么记
vain sounds like 'vein' — empty as a vein without blood
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