水复合生态系统
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We learn of complex water habitats and a fragile ecosystem of flora and fauna.
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。
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The agreement calls for the water system to be treated as a single complex ecosystem made up of countless tributaries, underground aquifers and smaller lakes all held in the Great Lakes basin.
NPR: Governors Meet on Access to Great Lakes
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