视乎面层的要求，托底纸有各种极端不同的性质。
Depending on the requirement of the top layer, backing papers vary very much in nature.
托底纸：用来支撑面层的纸以啬强度或承托面层。视乎面层的要求，托底纸有各种极端不同的性质。
Backing paper: a base layer to give strength or support to a top layer. Depending on the requirement of the top layer, backing papers vary very much in nature.
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