Coral reefs are already appreciated for their beauty.

珊绚丽的外表已备受赞赏。

Like coral reefs, they are a nursery for the oceans.

像珊一样它们是海洋的托儿所。

The coral reefs absolutely need human intervention to help.

珊绝对需要人类的干预来帮助。

Coral reefs are important for many reasons.

珊所以重要，有很多原因。

Coral reefs are under tremendous threats.

珊正面临巨大的威胁。

Let's go back to the coral reefs.

们再回到珊的例子上。

Healthy coral reefs have shrunk by nearly half.

健康的珊也已经缩减了近一半。

This can hurt ocean structures, called coral reefs.

这伤害被称为珊的海洋结构。

There's something very odd about coral reefs.

这里的珊看上去很奇怪。

Seagrass and kelp are particularly sensitive like coral reefs.

海草和海带特别敏感，就像珊。

Unfortunately, the coral reef ecosystem is a fragile one.

不幸的是，珊是一种脆弱的生态系统。

But Darwin also investigated coral reefs and their formation.

但达尔文也调查了珊及其形成方式。

Far better, some say, to turn old rigs into coral reefs.

若要全面考虑的话，有些人认为应该把老的钻塔转换成珊。

Healthy coral reefs are essential to a healthy marine ecosystem.

健康的珊对健康的海洋生态系统至关重要。

The coral reef in Arecibo is part of the beach.

阿雷西博的珊是海滩的一部分。

Coral reefs are often the first indicator of climate change.

珊往往是气候变化的第一个迹象。

Coral reefs are sometimes called the 'rainforests of the sea.'

珊有时被称作海里的热带森林。

We saw some amazing coral reef

们看到了一些令人惊叹的珊。

The story out there is that all coral reefs are dying.

据说，所有的珊都在逐渐死亡。

Oyster reefs provide much the same function as coral reefs.

牡蛎提供了与珊相同的功。