examining finger veins

例句：

1. 1. The doctor examined the patient's symptoms before making a diagnosis.
   医生在做出诊断前先检查了病人的症状。
2. 2.The scientist examined the samples for any contamination.
   科学家检查样本是否有污染。
3. 3. The detective examined the crime scene thoroughly before releasing the suspect.
   侦探在释放嫌疑人之前，仔细检查了犯罪现场。