kraft
n.（名词）A tough, usually brown paper made from wood pulp treated with a solution of sodium sulfate, used chiefly for bags and wrapping paper.牛皮纸：一种由经过硫酸钠溶液处理过的木浆制成的硬纸，通常为棕色，主要用来作袋子或包装纸
来源：Short for Swedish kraftpapper 瑞典语 kraftpapper的简写 kraft from Old Swedish krapt kraft 源自 古瑞典语 krapt papper [paper] papper [纸]
