珊瑚礁是地球上最脆弱、生态性最复杂、最多样化的海洋生态系统之一。

Coral reefs are one of the most fragile, biologically complex, and diverse marine ecosystems on Earth.

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第一我们复杂的金融系统脆弱的让人恐惧。

First, our complex financial system is awfully fragile.

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导游向我们介绍，这片水域生境的植物和动物生态系统复杂而脆弱。

We learn of complex water habitats and a fragile ecosystem of flora and fauna.

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