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Archaeologists soon used plastic sheets to cover them for protection.
考古专家随即就用塑料纸覆盖表面作为保护。
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These layers are sandwiched between two sheets of glass or plastic.
这些层夹在两片玻璃或塑料之间。
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These layers are sandwiched between two sheets of glass or plastic.
这些层夹在两片玻璃或塑料之间。
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