In a relatively brief period the archaeological record is reduced to mere scraps of stone, bone, glass, metal, and earthenware.
在短时期内，能留下考古记录的东西也都会退化为石头、骨头、玻璃、金属和陶器的碎片。
Although the young scavengers' digestive systems might be well adapted to digesting bone fragments, they are not suited to handling plastic, metal and glass.
尽管这些幼小食腐动物的消化系统也许足以消化碎骨头，但它们的胃对于塑料、金属物与玻璃是肯定束手无策的。
Archaeologists have unearthed evidence of glass-working and bone-carving workshops.
考古学家已发现了玻璃作坊和骨雕作坊的证据。
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