几乎完全的生物利用度，自然珊瑚矿物质离子。
Coral minerals are naturally ionized allowing for almost total bioavailability.
另一个组织认为，最近的人类活动，从自然的珊瑚破坏到污染，再到捕食者的消失，都引发了这些事件。
The other group maintains that recent human activities ranging from physical coral destruction through pollution to predator removal have triggered these events.
现在，让我们来看一个自然捕食者的具体例子，它会对珊瑚礁造成很大的伤害——那就是刺冠海星。
Now let's focus on a specific example of a natural predator that can cause a lot of damage to coral reefs—the Crown of Thorns, or CoT starfish.
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