powdered pumice

例句：

1. 1. The builders used this powdered pumice to create a smooth surface for the new road.
   建筑工人使用这种粉末状的火山灰来为新路创造一个光滑的表面。
2. 2.The volcano erupted, and the powdered pumice was scattered across the surrounding area.
   火山爆发了，粉末状的火山灰被撒满了周围的地区。
3. 3. The mineralogist analyzed the powdered pumice samples collected from the site.
   矿物学家分析了从该地点收集的粉末状火山灰样本。