执勤的英文：
(v) be on duty

参考例句：
  • Half the garrison is/are on duty.
    有半数卫戍部队在执勤.
  • Who was on guard the night the fire broke out?
    火灾发生那晚是谁在执勤？
  • The situation tonight is tense; get all the soldiers out
    今晚形势紧张，让所有的战士都出来执勤。
  • A policeman could meet danger any minute of his working day.
    警察在执勤时随时都可能遇到危险。
duty是什么意思：
n. 责任；义务；职责；职务；税
  • duty to rear; duty to provide support
    抚养义务
  • a truck; a heavy duty truck
    载重汽车
  • The path of duty is the path of safety
    尽职的路是安全的路
  • They never neglect their duties.
    他们从未玩忽职守。
  • You ought to do your duty.
    你应该尽到自己的责任。

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