Forest ecosystem is the biggest land ecosystem in the world.
森林生态系统是地球上最大的陆地生态系统。
The forest coverage was high, but the forest ecosystem was weak.
森林覆盖率较高，但森林生态系统较为脆弱；
Forest is the main body of earth ecosystem and the important national resource and assets.
森林是陆地生态系统的主体，是国家的重要资源和资产。
Forest just like lung of the earth is main part of terrestrial ecosystem.
森林是地球之肺，是陆地生态系统的主体。
Forest just like lung of the earth is main part of terrestrial ecosystem.
森林是地球之肺，是陆地生态系统的主体。
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