The Gerardia is believed to be about two thousand seven hundred forty-two years old.

Gerardia珊年龄大约是两千七百四十二年。

Coral reefs are rocklike structures built by layers of coral organisms, called polyps.

珊珊组织（珊虫）相叠形成，类似岩石。

Big waves hammered at the coral reef.

大浪不断冲击着那珊。

This paper introduces the geological features and the unhomogeneous weathering phenomenon of coral reef limestone of Sudan Port Area,and the bearing capacity of this layer.

单介绍苏丹港区珊灰岩质特征及不均匀风化现象,以及该基承载力。