internal diagnostics

例句：

1. 1. The doctor performed an internal diagnostics to determine the cause of the patient's symptoms.
   医生进行了一次内部诊断以确定病人症状的原因。
2. 2. During the surgery, the surgeon used an internal diagnostics to locate and remove the tumor.
   在手术过程中，外科医生使用内窥镜定位并切除肿瘤。
3. 3. The patient underwent an internal diagnostics to assess the health ofhis heart valves.
   患者接受了一次内部诊断以评估他的心脏瓣膜的健康状态。