| 单词 | 却是徒然 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔vain〕I knocked loudly in the vain hope that someone might answer.我敲门敲得很响，希望有人应声，却是徒然。牛津高阶〔vain〕The doctors gave him more powerful drugs in the vain hope that he might recover.医生们给他服用了更强效的药，希望他能够康复，却是徒然。剑桥高阶 |
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