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。