A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.
凹面镜把颠倒的实像投射到木板
，于是范艾克便可以在板子
。
法,银尖笔
义词
词;架;;
册,速写簿,写生簿;
;A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.
凹面镜把颠倒的实像投射到木板，于是范艾克便可以在板子。
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