| 单词 | vain effort |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔FAIL〕He stretched up his arms in a vain effort to reach the top of the embankment. 他伸直了双臂徒劳地想要抓到堤岸的顶部。朗文写作活用〔vainly〕I was singing in a vain effort to cheer him up.我唱歌试图让他高兴起来，结果是白费力气。柯林斯高阶〔vain〕A vain effort to quell the public's fears only made matters worse.旨在消除公众恐惧的努力毫无结果，反而把事情变得更糟了。韦氏高阶 |
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