Firstly, on the printing plate coated with a layer of photosensitive layer, and then make the exposure, use acid bath for etching.是什么意思_Firstly, on the printing plate coated with a layer of photosensitive layer, and then make the exposure, use acid bath for etching.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句