They are in a separate room where the temperature is controlled, to preserve the old paper in them.

它们在一个温度受到控制的单独房间里，以保存其中的旧纸。

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They are in a separate room where the temperature is controlled, to preserve the old paper in them.

它们在一个温度受到控制的单独房间里，以保存其中的旧纸。

youdao