diffuse wall cavity

例句：

1. 1. The oil diffused throughout the room.
   油液在整个房间中扩散开来。
2. 2. The news quickly diffused across the nation.
   新闻迅速传遍全国。
3. 3.The seeds diffused into the soil, germinating soon after.
   种子扩散到土壤中，很快就发芽了。