surface particle

例句：

1. 1.The particles on the surface of the water are moving around rapidly.
   水表面的粒子在快速移动。
2. 2.The researchers found that the surface particles were responsible for the chemical reaction.
   研究人员发现，表面粒子是化学反应的原因。
3. 3. The particles in the air are tiny and can cause breathing problems.
   空气中的粒子很小，可能会引起呼吸问题。