虽然Bochs可以支持许多映像类型，但是对于性能来说，则要求平面映像，这是因为运行时动态增长是没有必要的。
Bochs can support a number of image types, but for performance, request flat, because no run time dynamic growth will be necessary.
把平面镜的映像和实物同时拍摄成底片。
The image and material object of plane mirror are simultaneously photographed on negative.
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