Doctor Liu is on call at all times.
不论什么时候刘医生随叫随到。
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。
Everyone needs a friend who you can call at the drop of a hat.
每个人都需要一个随叫随到的朋友，他会对你说：“嗨，我就来。”
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