percusion powder

例句：

1. 1.This is a powder made from rice.
   这是由大米制成的粉末。
2. 2. The fines in the soil are essential for plant growth.
   土壤中的细粒对植物生长至关重要。
3. 3. The dust from the wind covered the entire room.
   风带来的灰尘覆盖了整个房间。