emergency circulation

例句：

1. 1. Thehospital's emergency department is always busyduring emergencies.
   医院的急诊部门在紧急情况下总是很忙。
2. 2. During the storm,the power company had to implement emergency circulationto prevent blackouts.
   暴风雨期间，电力公司不得不实施应急循环以防止停电。
3. 3. Theengineers were working on an emergency circulationsystem for the new bridge.
   工程师们正在为新桥安装一个应急循环系统。