而且不少叫emergency department的。比如Stanford

https://stanfordhealthcare.org/medical-clinics/emergency-department.html

有兴趣看一下wiki的Emergency department词条

https://en.wikipedia.org/wiki/Emergency_department

电视剧（ER） vs. 真正生活（ED）

A Comparison of Televised and Real-Life Emergency Medicine

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3573875/