The most extreme type of shiny refiector—a mirror—will keep the light focused pretty much as narrowly in the refiection.
镜子是一种极端的光面反光板，它反射的光线几乎与入射光线一样窄。
The most extreme type of shiny refiector—a mirror—will keep the light focused pretty much as narrowly in the refiection.
镜子是一种极端的光面反光板，它反射的光线几乎与入射光线一样窄。
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