1. The water/cement ratio and cement content are two main factors which reflect the impermeability of concrete. 水灰比和水泥用量是反映混凝土抗渗性的两个主要因素。
2. Rigid containers (cans) have the most favorable properties of ( , such as ) protectiveness, impermeability, and ease of sterilizing. 硬质罐具有保护性好、密闭性强和易于杀菌的特性。
3. Membrane impermeability. Ideally, a buffer will not readily pass through cell membranes, this will also reduce the accumulation of buffer compound within cells. 膜的不通透性。理想的缓冲液应该不容易通过细胞膜，同样这可以减少缓冲液组分在细胞内的聚集。
英英解释
n.
1. the property of something that cannot be pervaded by a liquid
