disperse medium

例句：

1. 1. The crowd dispersed quickly after the announcement.
   宣布之后人群迅速散开。
2. 2. The firefighters dispersed the flames with water.
   消防员用水驱散了火焰。
3. 3.The wind dispersed the clouds and revealed the sun.
   风吹散了云朵，露出了太阳。