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.
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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