The lower layer is composed of a dry paper-pulp layer and a cloth-surface layer from top to bottom. The lower layer can be a plastic-paper layer.

下面层从上往下又由干纸浆层和布面层组成，下面层亦可是一塑料纸层。

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The lower layer is composed of a dry paper-pulp layer and a cloth-surface layer from top to bottom. The lower layer can be a plastic-paper layer.

下面层从上往下又由干纸浆层和布面层组成，下面层亦可是一塑料纸层。

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