| 单词 | 结果是白费力 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔free〕In vain he tried to free the rope around his hands.他想挣脱掉捆住他双手的绳子，结果是白费力气。剑桥高阶〔start〕A lot of people who lose weight gain it back over time, and end up back where they started.许多减了肥的人过一段时间又恢复了体重，结果是白费力气。朗文当代〔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In vain he tried to free the rope around his hands.他努力要松开捆住他双手的绳子，结果是白费力。剑桥国际 |
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