绿洲生态系统是一类独特的生态系统，具有独特的结构和功能。

Oasis-ecosystem is a kind of particular ecosystem. It has special structure and function.

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绿洲生态系统是一类独特的生态系统，具有独特的结构和功能。

Oasis-ecosystem is a kind of particular ecosystem. It has special structure and function.

youdao