microparticle

例句：

1. 1. The microparticles in the water are tinyenough to be invisible to the nakedeye.
   水中的微颗粒足够小，肉眼看不见。
2. 2. Researchers have found that microparticles can be used to detect diseasesin early stages.
   研究人员发现，微颗粒可以用来检测疾病的早期阶段。
3. 3. The microparticlesin the paint were too small tosee with the naked eye.
   油漆中的微颗粒太小，用肉眼无法看见。