The world is a compound ecological system, with each main factor mutually contacting and interacting to maintain the harmony of world.
世界是一个复合的生态系统，各要素之间相互联系，相互作用，维持着整个世界的和谐。
The world is a compound ecological system, with each main factor mutually contacting and interacting to maintain the harmony of world.
世界是一个复合的生态系统，各要素之间相互联系，相互作用，维持着整个世界的和谐。
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