demonstration ophthalmoscope

例句：

1. 1. The doctordemonstrated the operation to the patient during thesurgery.
   医生在手术中向病人演示了手术过程。
2. 2. The ophthalmologist used a demonstration ophthalmoscope to examine the patient's eye.
   眼科医生使用演示式眼科显微镜来检查患者的眼。
3. 3. During the presentation, theexpert demonstrated various techniques for treating eye diseases.
   在演示中，专家展示了治疗眼部疾病的各种技术。