音标: 英 [ˈpɜ:mɪəbl] 美 [ˈpɜ:rmɪəbl]
1. And this is what makes the difference between permeable and impermeable surfaces.
这就是可渗透表面 和不可渗透表面的区别所在
2. That would require knowing the permeability of free space and natural units.
那会需要知道 自由空间与自然单位的磁导率
