Cover the hole with the plastic sheet.

用塑料薄片把洞盖上。

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This helps because the plastic cover keeps the stamps off the wet air.

这是有帮助的，因为塑料盖使邮票远离潮湿的空气。

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Next, cover the hole with the plastic sheet, and secure the edges of the plastic with dirt.

接下来，用塑料板盖住洞口，并用泥土固定塑料板边缘。

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