Drying oils such as walnut oil was favored at one time since it combined with the shellac and, when dry, worked as a hardening agent.是什么意思_Drying oils such as walnut oil was favored at one time since it combined with the shellac and, when dry, worked as a hardening agent.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句