Dormancy for hard seeds is caused by impermeability to water and gas and mechanical constraint of the seed coat.
硬实种子种皮透水透气性差和对胚生长的机械限制，引起种子休眠。
soil permeability meter
土壤透水透气度测定仪
closed so tightly as to be airtight or watertight.
关闭的很紧的，不透气的或不透水的。
Conservation of water sensitive objects with moisture permeable materials;
透水气材料在水敏感性文物保护中的应用
wool-like and water proofing agent with permeability
仿毛防水透气整理剂
clear water; clear plastic bags; clear glass; the air is clear and clean.
透明的水；透明的塑料袋；透明的玻璃；空气透明、清鲜。
Effects of Temperature on Gas and Water Vapor Permeability of Preservative Film
温度对保鲜膜透气和透湿性能的影响
Measurement and Comparison of the Dynamic Permeability and the Static Permeability of Airbag Fabrics
安全气囊织物动态透气性与静态透气性的测试
"Fan me, Mary, fan me!
"给我透透气，玛丽，给我透透气！
Test methods for water vapour transmission of building materials
GB/T17146-1997建筑材料水蒸气透过性能试验方法
This adversely affects water movement, permeability, and aeration.
这对水分移动，渗透度及通气性有不利影响。
Poor drainage causes deficient soil aeration and death of the roots.
排水不良能减低土壤的透气性，使根死亡。
Rigden's permeameter
里格登透气性试验仪
testing method for permeability to gases of refractory bricks
耐火砖透气性试验方法
Vapor permeable stretch film： Soft breathable diaper.
透气性延伸膜：如质感柔软之透气性纸尿布制品。
Note: Air permeability and breathability are not synonymous.
注意：空气渗透性和透气性是两个不同的概念。
air transmission coefficient
透气系数，空气透过率
Study on hygroscopicity and permeability of inner layers of poison-proof permeable protective suits
透气防毒服内层材料的吸湿透气性能研究