| 单词 | 手段和时机 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔ball〕The detective has to discover the motive, the means and the opportunity and has to keep these three balls in the air.那名侦探必须查明动机、手段和时机，而且对这三项的调查必须同步展开。柯林斯高阶〔ball〕The detective has to discover the motive, the means, and the opportunity and has to keep these three balls in the air.侦探必须把作案动机、手段和时机调查清楚, 三者缺一不可。外研社新世纪 |
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