The animal's intestine is a complex ecosystem inhabited by microorganisms, including pathogenic bacteria.

动物的肠道是一个复杂的微生物生态系统，由各种微生物组成，包括致病菌。

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The animal's intestine is a complex ecosystem inhabited by microorganisms, including pathogenic bacteria.

动物的肠道是一个复杂的微生物生态系统，由各种微生物组成，包括致病菌。

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