A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.
凹面镜把颠倒的
射到木板上，于是范艾克便可以在板子上描
。
法,银尖笔;
;
;
;A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.
凹面镜把颠倒的射到木板上，于是范艾克便可以在板子上描。
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