透水性

zhuān kuài pū zài shā li lái zēng jiā tòu shuǐ xìng

砖块铺在沙里，来增加透水性。

The bricks were bedded in sand to improve drainage.

zhè ge dōng xi de tòu shuǐ xìng bù cuò

这个东西的透水性不错。

This thing has good water permeability.