During the process of etching (drawing 5), it will use the mixture of ferric chloride, water and copper sulphate, to etch the copper plate.是什么意思_During the process of etching (drawing 5), it will use the mixture of ferric chloride, water and copper sulphate, to etch the copper plate.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句