A process of etching capable of producing several tones by varying the etching time of different areas of a copper plate so that the resulting print resembles the flat tints of an ink or wash drawing.是什么意思_A process of etching capable of producing several tones by varying the etching time of different areas of a copper plate so that the resulting print resembles the flat tints of an ink or wash drawing.在线翻译_英语_读音_用法_例句