reefs

" We know that there are many contributing factice factors to the world coral reefs, we water quality of the reef.

"我们知道有很多因素影响瑚周围水质量。

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

瑚由瑚组织（瑚虫）层层相叠形成，似岩石。

Taking into account of the biogenic components, the algal dolomite, the main component of algal reefs, consisted of Cladosiphonia sinensis, Serpula shandongensis etc.

体在成分上以枝管藻、龙介虫等构成藻白云岩为主，具有良好储集性能。

It’s only been latterly that we’ve discovered that it’s lots of individual reefs, around about 2,900 separate reef systems which make up the Great Barrier Reef.

直到近来我们才发现，它们其实是众多独石，大约有2900个独石系，组成了大堡。