The reverse side of the mirror should be in continuous contact with air without needing ventilation .
反射镜的背面应经常与空气接触但无需通风。
The reverse side of the mirror should be in continuous contact with air without needing ventilation.
反射镜的背面应经常与空气接触但无需通风。
Why is it that the mirror appears to reverse left and right, but not up and down?
为什么镜子中的影像似乎颠倒了左右，却没有颠倒上下？
Why is it that the mirror appears to reverse left and right, but not up and down?
为什么镜子中的影像似乎颠倒了左右，却没有颠倒上下？
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