powder porosity

例句：

1. 1. The new paint has a high powder porosity, which makes it easy to clean.
   这种新油漆的粉末孔隙率很高，很容易清洗。
2. 2. The soil's porosity plays a crucial role in its ability to retain water and nutrients.
   土壤的孔隙率对其保持水分和养分的能力起着至关重要的作用。
3. 3. The engineer analyzed the structure of the rock and determined its porosity, which helped him designa more efficient dam.
   工程师分析了岩石的结构并确定了其孔隙率，这帮助他设计了一个更高效的大坝。