| 单词 | 这个关键词 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔operative〕A small dram of whisky may be prescribed by doctors for those over 60 to help them sleep. It is vital though to emphasize that 'small' is the operative word.医生可以建议60岁以上的老人少量地喝点威士忌以改善睡眠，然而至关重要的是必须强调“少量”这个关键词。柯林斯高阶 |
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