The damp proof course is a double layer of locally available PE-film.

所谓防潮层，即是由两层当地可获得的聚乙烯薄膜组成。

youdao

The damp proof course is a double layer of locally available PE-film.

所谓防潮层，即是由两层当地可获得的聚乙烯薄膜组成。

youdao