diffuse X-ray background

例句：

1. 1. The chemical wasdiffused throughout the room.
   这种化学物质在整个房间中扩散开来。
2. 2. The oil diffused into the water.
   油开始在水里扩散。
3. 3. The seeds diffused throughthe soil.
   种子通过土壤扩散开来。