medical witness

例句：

1. 1. The doctor asked the patient's family to provide a medical witness during the examination.
   医生要求病人的家人在检查时提供一名医学证人。
2. 2. The medical witness testified that the patient had been under medication for several days before the accident.
   医学证人作证说，患者在事故发生前几天一直在服用药物。
3. 3. The medical witness confirmed that the patient had suffered from chronic pain for years.
   医学证人证实，患者多年来一直遭受慢性疼痛的折磨。