一种光学装置，可将物体虚像投影到一平面之上，多用于跟踪。
An optical device that projects a virtual image of an object onto a plane surface, especially for tracing.
该装置的光学系统包括透镜、反射镜及投影屏等，其它部分包括载有各种发型模式影像的胶片。
The optical system of the device comprises a lens, a reflecting lens, a projection screen, etc. Other parts of the device comprise image films with various hair style modes.
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