For six weeks out of the year, I'm on 24/7 on-call duty.

一年有六个星期，我必须全天候随叫随到。

The report by two state health-care groups says the impact will be felt most acutely in overextended emergency rooms, where finding specialists for on-call duty is difficult today.

两个国家保健组表示，在拥挤的急诊室会明显感受到这种影响是多么强烈。在那里，一般是没有专家24小时值班的。