The great barrier reef is the world's largest network of coral structures.

大堡是世界最大的珊群。

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.

珊绝对需要类的干预来帮助。

Coral bleaching is triggered by changes in the coral's environment—including increased temperature, sunlight, or pollutants.

发全球珊化的是珊环境变化，其中包括气温上升、阳光变化或污染物。

It is a very rare kind of reef.

这是一种非常罕见的珊。

Someone else has arrived at the reef.

又有鱼来到了珊。

Let's go back to the coral reefs.

我们再回到珊的例子上。

It's reportedly in impeccable and unharmed condition.

据报道，珊完好无损。

Setting up marine protected areas could help reefs.

建立海洋保护区可以帮助珊。

And the corals we are finding really are not responding very well.

我们发现的珊反应并不好。

The healthy reef sounds that you just heard can be used to regenerate coral reefs.

你刚听到的健康珊的声音可以用于再生珊。

There are a number of threats to the health of coral reefs.

珊的健康饱受威胁。

Which one of these contains the world's largest collection of coral reefs?

世界上最大的珊群在哪里呢？

They help to (inaudible) and create reefs.

它们帮助形成(听不见的)珊。

Coral reefs are important for many reasons.

珊之所以重要，有很多原因。

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

珊有时被称作海里的热带森林。

There's something very odd about coral reefs.

这里的珊看上去很奇怪。

Beyond the coral stretches a world of shifting sand.

在珊上，是流砂的世界。

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

据说，所有的珊都在逐渐死亡。