Reefy boundstone or framework commonly contains large cavities formed through rapid organic growth.

礁块的粘结岩中通常有大洞，是由于生快速生形的。

The olive sea snake is a peaceful animal that travels along the reefy sea bottoms of the tropics in search of small prey.

行和海洋。这橄榄色的海蛇是一种和平的安宁的，巡游多数沿着热带的海洋暗礁的底部寻找小的牺牲者。