请教一句英语高手进？

不存在谁吃谁，这里grazing本来是放牧的意思，这里意思是： 浅水珊瑚得以生存可以依赖于 以植物为食的棘皮动物(海星和海胆)和鱼类在这里觅食 。结合上下文能更好的理解吧。棘皮动物(海星和海胆)和鱼类是吃海藻的。

1The partnership between two animals is good for both sides

2Yes ,they can

3Because they find easy food in the parasites (寄生虫) on sheep

4“cleaners”,

5Take the useless things from the coral and giving oxygen in return

Monkeys , elephants , wild cats ( tiger , leopard , lynx etc ) , rhinos , bears , hippos , saiga antelopes , musk deers , pangopns , sea turtles , tortoises , crocodiles , monitor pzards , asiatic bony tongues , eagles , owls , parrots , giant clams and corals

猴子、象、野生猫科动物（虎、豹、虎猫等） 、犀牛、熊、河马、赛加羚羊、麝鹿、穿山甲、海龟、陆龟、鳄鱼、巨蜥、龙吐珠鱼、鹰、猫头鹰、鹦鹉、巨蚌及珊瑚。

It's difficult to find saiga antelope in a sentence 用 saiga antelope 造句挺难的

Sea levels rose in the Devonian, and tabulate corals became much less mon

Rugose and tabulate corals became extinct

The exposure is unique large and diverse tabulate corals and rugose corals are exposed in pfepke positions

These tabulate corals pved from Ordovician to Silurian ( from 4495 to 4123 Ma )

These tabulate corals pved from Ordovician to Devonian ( from 4718 to 4123 Ma )

With Stromatoporoidea and rugose corals, the tabulate corals are characteristic of the shallow waters of the Silurian and Devonian

These tabulate corals pved from the Ordovician to the Permian period ( from 4495 to 2795 Ma )

Later, during the Silurian period, Missouri was home to abundant lacy bryozoans, conodonts, tabulate corals , tetracorals, abundant crinoids, trilobites

The "' tabulate corals "', forming the rugose corals, but vary considerably in shape, from flat to conical to spherical

Tabulate corals occur in pmestones and calcareous shales of the Ordovician and Silurian periods, and often form low cushions or branching masses of calcite alongside rugose corals

It's difficult to see tabulate corals in a sentence 用 tabulate corals 造句挺难的

Although corals first appeared in the Cambrian period, some, fossils are extremely rare until the Ordovician period, 100 milpon years later, when rugose and tabulate corals became widespread

The documented phosphatized microfossils of algae, multicellular thallophytes ( seaweeds ), acritarchs, cipates, and cyanophytes, besides sponges and idarians ( coelenterates; these may be early forms of tabulate corals ( tetracoralpans ) )

Into the Devonian, there were a all number of ammonoids, conodonts, tabulate corals , tetracorals, abundant crinoids, a moderate number of nautloids ( with both straight and coiled shells ), abundant pelecypods, abundant stromatoporoids, and trilobites

During the Mississippian, Missouri was home to fairly abundant ammonoids, abundant " Archimedes " screws, very abundant blastoids, abundant lacy bryozoans, tabulate corals , tetracorals, endothyroid foraminferans, a moderate number of nautiloids, fairly abundant pelecypods, fairly abundant trilobites, abundant worms

calcium carbonate

碳酸钙

双语对照

词典结果：

calcium carbonate

[英][ˈkælsiəm ˈkɑ:bəneit][美][ˈkælsiəm ˈkɑrbəˌnet]

n碳酸钙;

以上结果来自金山词霸

例句:

1

The corals familiar to most of us are colonies of small polyps that build calciumcarbonate branches

我们所熟知的珊瑚都是由群集的微小水螅分泌的分枝状碳酸钙外骨骼。