drop pit的用法和樣例：
例句
- The reason of the pit reduced the nucleation energy is analyzed.
分析和討論了凹坑降低金剛石核形成能的原因。 - 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.
例如響尾蛇在頭部兩側小凹坑裡的器官充滿數千個受體細胞，這實際上就是顯微的紅外線感受器。
