Coral reefs are already appreciated for their beauty.

珊瑚礁绚丽的外表已备受赞赏。

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

像珊瑚礁一样它们是海洋的托儿所。

The thriving coral reef is incredibly biodiverse.

繁荣的珊瑚礁有着令人难以置信的生物多样性。

Coral reefs are under tremendous threats.

珊瑚礁正面临巨大的威胁。

Let's go back to the coral reefs.

我们再回到珊瑚礁的例子上。

Healthy coral reefs have shrunk by nearly half.

健康的珊瑚礁也已经缩减了近一半。

This can hurt ocean structures, called coral reefs.

这可能会伤害被称为珊瑚礁的海洋结构。

Seagrass and kelp are particularly sensitive like coral reefs.

海草和海带特别敏感，就像珊瑚礁。

But Darwin also investigated coral reefs and their formation.

但达尔文也调查了珊瑚礁及其形成方式。

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瑚礁。