sulci of skin

例句：

1. 1.The doctor examined the patient's skin for any signs of infection.
   医生检查了病人的皮肤，以查看是否有感染的迹象。
2. 2.The surgeon made a small incision in the patient's skin to remove the tumor.
   外科医生在病人的皮肤上做了一个小切口来切除肿瘤。
3. 3. The wound on the patient's arm had healed well, leaving only a few sulci of skin visible.
   病人手臂上的伤口愈合得很好，只有一些皮肤的沟痕可见。