policeman on post

• 值勤的警察

policeman on post的用法和样例：

例句

1. He was asleep at his post of duty.
   他在值勤的岗位上睡着了。
2. He had put up a terrific struggle, the Wanganui surgeant on escont duty told Paddy.
   在万加楼依值勤的警卫中士告诉帕迪，他儿子打了一场可怕的战斗。