sulci

例句：

1. 1. The carpenter carefully carved the wood into a beautifulsulcus.
   木匠小心翼翼地将木头雕刻成一道美丽的沟槽。
2. 2. The ancientcity was surrounded by deep sulci that were difficult to navigate.
   这个古城被深深的沟槽包围着，难以通行。
3. 3. The scientist used a microscope to examinethe intricate sulci of thecoral.
   科学家使用显微镜来检查珊瑚的复杂沟槽。