Monitor on duty
值日───to be on duty;班长───monitor
It's time for you to be on duty today.───今天该你值日了。到我们出发的时候了。
Because each holiday, 7-day long or 1-day short, my elder brother has to be on duty for emergency.───因为不管是7天的长假，还是1天的假期，我哥哥都得应急值班。
Now comes your turn to be on duty.───现在轮到你值日了。
Carl: The famous company that I interviewed with last week phoned me today and informed me to be on duty next monday.───上个星期我参加面试的那个知名公司今天来电话了，通知我下周一正式上班。
It's a pleasure for me to be on duty on the first day of the new term.───在新学期的第一天做值日生是我的荣幸
Please keep your mobile phone reachable until your duty end. Please inform the Operator and Duty Manager when you start to be on duty.───请保持您的手机在店值期间开启并处于畅通状态。当您开始值班时，请通知总机和前厅值班经理。
For the trouble with the great and the good is that we expect them to be on duty the whole time.
Although she loved her work, never before had she wished to be on duty on a day off.
While they were partying, one of the guests, who was not a life saver, fell into the swimming pool fully clothed and drowned, even though four lifeguards were supposed to be on duty at the time!
Tokyo's trains and metros meet thousands upon thousands people to be on duty and off duty.