degree of porosity

• 孔隙度等级

degree of porosity的用法和样例：

例句

1. All CMMs are constructed with five levels of maturity.
   所有的能力成熟度模型都有五个成熟度等级构成。
2. Grado utilizes a special processing method to increase the material's porosity.
   歌德采用了特殊的处理方法来提高材料的孔隙度。
3. The residual porosity indicates the compaction state of the formations.
   而剩余孔隙度又反映了地层的压实状态。