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美国的废弃牡蛎壳，为什么捡回来大量回收？这不是多此一举吗？
美国人简直太奇怪了，别人的废弃牡蛎壳都当作垃圾填埋了，他们却捡回来大量回收。美国人为什么要回收牡蛎壳？他们要这些牡蛎壳，到底有什么用？
不可思议的科普30/71
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