on call

基本解释

Her team has been on call since 9/11; the hero bots' first mission was to comb through the rubble at the World Trade Center.
他的团队从9·11时间之后一直待命；主角机器人的第一次任务是在世贸中心彻底对瓦砾进行彻底搜索。
Seeing as paramedics have high stress jobs that require them to be on call and ready to save lives at a moment's notice, you might expect their mean annual salary to be higher.
可以看见的是，护理人员有如此高压力的工作，要求他们随叫随到，并时刻准备好立即抢救生命，你可能想象他们的工资应该会更高些。
By the time I got my morning briefing from Carville, Stephanopoulos, and whoever else needed to be on call that day, they could lay out exactly where we were and what we needed to do.
某天早晨，卡维尔、斯迪法诺普洛斯和那天所有必须随叫随到的人向我汇报了工作，他们可以精确地分析出我们处于的形势和必须采取的措施。

For the next 12 hours, the medevac teams and machines will be on call to evacuate wounded troops from anywhere in eastern Afghanistan to Bagram's military-run trauma hospital.
I wonder have any of you reflected on, I don't want to call it shadow side, is not domesticated.
不知道你们有没有人想过这个问题，我不想说这是自然的阴暗面，无法驯化的一面。
普林斯顿公开课 - 人性课程节选
Do you have available to you what we call the hacker editions in more details on those in the courses syllabus?
你是否有黑客版套题,比教学大纲上的版本更详细？
哈佛公开课 - 计算机科学课程节选

There are no limits on call times, and the resulting sessions occasionally resemble protracted talk therapy.
NEWYORKER: Happy Feet

used to describe workers who are available to make official visits at any time when they are needed
If a worker such as a doctor is on call, he or she is available to work or make official visits at any time when needed.