accident and emergency observation ward的用法和样例：
- At the Royal Bolton Hospital, staff have begun playing classical music in the accident and emergency (A&E) ward, as well as in the eye ward and the main reception area.
- Accident and emergency departments of major public hospitals had 2521359 attendances,or 6908 per day.
- All of them sought medical treatment from the Accident and Emergency Department of North District Hospital.
- She attended the Accident and Emergency Department of Yan Chai Hospital and did not require hospitalisation.