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ecological recycling
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ecological recycling
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ecological recycling
生态循环
在生态系统中,物质从环境开始,经生产者、消费者和分解者,最后回到环境中去,完成一个从简单无机物到有机复合物,最终又回到简单无机物的过程。
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archival-writing restoration technology
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Archives and Manuscripts—— SAA Basic manual series
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archives backup from different places
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