从而使纸张的物理强度提高、纸的吸水性和透气性降低。
Therefore could enhance the paper physical strength and reduced permeability and water absorption.
乌石山矿可以改善烧结过层的透气性，提高垂直烧结速度并降低烧结矿的生产成本。
Wushishan iron ores can improve the sintering bed permeability and increase vertical sintering velocity, and decrease production cost of sinter.
结果表明： 涂饰和贴膜会降低皮革的透气性。
The results show that finishing and transfer coating will reduce the air permeability of leather.
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