A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.
把颠倒的实像投射到木板上，于是范艾克便可以在板子上描画。
A concave mirror would project a real inverted image of the silverpoint onto the panel, which van Eyck would trace.
把颠倒的实像投射到木板上，于是范艾克便可以在板子上描画。
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