不透水膜,不透水层;
The external layer of the skin is relatively impermeable to water.
皮肤的外层不透水.
The impermeable layer has aged, we must find someone to repair it.
楼顶的防渗层已经老化, 要请人来修理了.
纳米英语 · 双语娱乐资讯
纳米英语 · 英语词汇