microscopic particle

synthesis conditions were optimized with the test of microscopic particle image system and sem.

采用图像颗粒显微系统和扫描电镜（SEM）加以表征，优化合成条件。

All the systems in nature including physical system, chemical system, biological system, microscopic particle, and celestial body in astrospace exhibit nonlinear dynamic behaviors.

自然界中存在的各种体系，包括物理系统，化学系统，生物系统，小至微观粒子运动，大至宇宙空间天体演化，他们的运动大多呈现非线性动力学行为。

to make an airplane contrail, you need water and some kind of microscopic particle for the water to condense around.

创造一条飞机的轨迹，你需要一些水和一种能让水在它周围凝聚的各种微小粒子。