But Darwin also investigated coral reefs and their formation.

但达尔文也调查礁及其形成方式。

Coral reefs are already appreciated for their beauty.

礁绚丽的外表已备受赞赏。

Warming oceans can harm coral reefs, which turtles need to survive.

海洋变暖会损害海龟赖以生存的礁。

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

像礁一样它们是海洋的托儿所。

We have to remember that there are still coral reefs that are alive.

我们必须记住，礁还活着。

The archipelago is celebrated for its rich marine life and underwater coral reefs.

这个以其丰富的海洋生物和水下礁而闻名。

Almost all of this is ocean and living coral reefs that protect the islands.

保护屿的几乎都是海洋和生物礁。

But when reefs are bleached or damaged, the fish flee, and the reef suffers.

但当礁白化或受损后，鱼会逃走，礁石也会遭受破坏。

The island nation boasts brilliant white sands, clear waters and vibrant coral reefs.

这个有洁白无瑕的沙滩，清澈透明的海水及充满生机的礁。

Couples can enjoy the white beaches, clear waters and vibrant coral reefs around Palawan Island.

情侣们可以享受巴拉望周围的白色海滩、清澈的海水和充满活力的礁。

The reefs and rough waters made it difficult for ship captains.

礁和汹涌的海水使船长难以驾驭。

Let's go back to the coral reefs.

我们再回到礁的例子上。

If you were to go to most coral reefs today, you'd hear something like this.

你去看看现在大部分的礁，会听见这样的声音。

It found them to be the biggest current threat to the world's coral reefs.

研究发现，它们是目前世界上礁面临的最大威胁。

Healthy coral reefs have shrunk by nearly half.

健康的礁也已经缩减近一半。

This can hurt ocean structures, called coral reefs.

这可能会伤害被称为礁的海洋结构。

So how did the reefs come to be?

所以礁石是怎样形成的呢?

Once we get to 2 degrees, we lose all coral reefs, for example, in the world.

一旦我们达到2度，我们就会失去例如世界上所有的礁。

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

你刚听到的健康礁的声音可以用于再生礁。

Coral reefs are under tremendous threats.

礁正面临巨大的威胁。