The words inside of this word are " pneumono, " which has to do with your lung; " ultra, " which means very – " ultramicroscopic" means very small, something you could only see with a microscope.

这个词里面的词是“pneumono” ，与你的肺有关；“ultra” 意思是非常——“ultramicroscopic” 意思是非常小，只有用显微镜才能看到的东西。