When this glass was backed with a covering of lead or tin, a mirror reflecting at least some truth as to color resulted, but not so much could be said for the truth in respect to the form of its reflections.

• 当这种玻璃背面涂上一层铅或锡时就成了镜子，这种镜子至少反映出了各种颜色的一些真实情况，但就反映的形状而言，并无真实可言。