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what is the main ingredient of the pebbles

    鹅卵石的主要成分是石英岩，含酸性物质，一旦海水进入后，PH值将降低，我们都知道海水需要的PH为弱缄性，适合生物生存的环境在7.9-8.6之间，一点离开这个范围过长，生物就将死亡。
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