气象仪将大气现象的映像，如云，投射到一个圆顶内侧的一种光学装置
An optical device designed to project images of atmospheric phenomena, such as clouds, on the inside of a dome.
底片像一种映像，在里面物体的有光的部分显示出暗色，而阴暗的部位显示出光亮
An image in which the light areas of the object rendered appear dark and the dark areas appear light.
