在自然界中也发现有其他非渗透性薄层物质。
Thin layers of other impermeable materials are found in nature, too.
一种来自免疫系统的信使物质是‘开门器’，它能使肿瘤组织的血管有渗透性，以便让沙门菌通过并摧毁肿瘤。
A messenger substance from the immune system is the door opener: It makes blood vessels in the cancerous tissue permeable; enabling the bacteria to conquer and destroy the tumor.
对含泥量高、渗透性差的矿石，添加渗滤物质以改善渗透性能进行了研究。
Bad penetrability ore which has high mud content is examined by adding penetrative matter in order to improve ore penetrability.
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