The external end-surface of the lower layer is provided with a paper layer or a plastic film which is bound together with the lower surface layer through the non-setting adhesive.
下表面层外端面上设有一层纸或塑料膜，并通过不干胶与下表面层贴合在一起。
The external end-surface of the lower layer is provided with a paper layer or a plastic film which is bound together with the lower surface layer through the non-setting adhesive.
下表面层外端面上设有一层纸或塑料膜，并通过不干胶与下表面层贴合在一起。
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