very slow permeability

例句：

1. 1.The material has excellent permeability to gases.
   这种材料对气体有很好的渗透性。
2. 2.The new paint has a higher permeability than the old one.
   新油漆的渗透性比旧油漆高。
3. 3.The soil's permeability is crucial for plant growth.
   土壤的渗透性对于植物生长至关重要。