steel pit

• 凹坑

steel pit的用法和样例：

例句

1. The reason of the pit reduced the nucleation energy is analyzed.
   分析和讨论了凹坑降低金刚石核形成能的原因。
2. A rattlesnake, for instance, has one small pit on each side of its head, filled with thousands of receptor cells, which are actually microscopic-sized infrared sensors.
   例如响尾蛇在头部两侧小凹坑里的器官充满数千个受体细胞，这实际上就是显微的红外线感受器。