Definition: a very small piece of something Level: C2
空气中充满了微小的灰尘颗粒。
The air was thick with tiny dust ___particles.
该过程将材料研磨成微观颗粒。
The process grinds the material into microscopic ___particles.
在显微镜下，我们观察了每一个单独的微粒。
Under the microscope, we observed each individual ___particle.
