| 单词 | 在值勤时 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔line〕The police officer was killed in the line of duty.这位警察在值勤时被杀害。麦克米伦高阶A policeman could meet danger any minute of his working day. 警察在值勤时随时都可能碰到危险。译典通 |
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