The doctor is on call with hospital tonight.

这名医生今晚执勤候诊

We have an on call engineer to respond to your emergencies.

我们有一位值班研发 可以响应突发事件

In theory I'm on call day and night.

理论上，我不分昼夜随叫随到。

See if you can rework your schedule and come up with practical ways to reduce the number of hours you're on call.

看看你能否修改你的时间表，想出切实可行的方法来减少你待命的时间。

He kept FBI agents on call 24 hours a day to do random tasks around his house—like repairing his lawnmower.

他让 FBI 特工每天24小时待命，围绕着自己的房子去执行一些随机的任务——比如说修理他的剪草机。

I'll be on call the night of the party.

在聚会的晚上我将随时听凭召唤。

Doctors work an average of 90 hours a week, while a few are on call for up to 120 hours.

医生们平均每周工作90个小时，而有些出诊长达120个小时。