兩塊緊密相依的礁石，在雨水溶蝕下，形成具體而微的石灰岩洞。

Two reefs,which are close together, form a small limestone cave through rain erosion.

珊瑚礁在隆起的過程中，受侵蝕及重力的作用而形成的裂谷。
Two reefs,Ａrift valley is formed as coral reefs are eroded and pulled by gravity during an uplift.