Small particles (such as pollen or smoke particles) suspended in a liquid or gas are observed to move around in a random, erratic fashion
Brownian motion is the erratic motion of small particles when observed through a microscope
转载自savemyexams
翰林课程体验,退费流程快速投诉邮箱: yuxi@linstitute.net 沪ICP备2023009024号-1