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

礁块粘结岩成骨架中通有洞，是由于生物快速生成形成。

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。这橄榄色海蛇是一种和宁动物，它巡游多数沿着热带海洋暗礁底部寻找小牺牲者。