电竞外围投注平台|双语科技百科(化学) 第42期:造纸术
Papermaking造纸术Papermaking is considered to be one of the four great inventions of anaent China. Before the papermaking technology was invented, peo-ple caNed or wrote Chinese characters on tortoise shells, animal bones, bamboo slices, wooden plates, and thin tough silks. Torfoise shells, animal bones and wooden plates were too heavy to use while silks were too expensive. Around the early period of the Westem Han Dynasty, people made paper from hemp and ram-ie. Initially, this was very rough and not suitable for writing.造纸术是中国古代“四大发明”之一。