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解析:参考译文
The invention of paper making is a great contribution to the world’s cultural development and international communication．The earliest Chinese characters were carved on animal’s bones or tortoise’s shells．During the Warring States Period． bamboo slips were used instead．However，bones．bamboo slips and woods were too heavy to carry．During the Western Han Dynasty．the noble caste wrote on thin paper made of silk or cotton．It’s easy to write and even excellent to paint on this kind of paper．However，it was so expensive that the civilians couldn't afford it。In105 A．D．，Cai Lun，a high-ranking official in the Eastern Han Dynasty，learned from the old way of paper making and invented a new cheap plant fiber paper．
难点注释
1．第一句中，“对……是一个重大的贡献”翻译为a great contribution to…。
2．第二句中，“刻在……上”译为were carved on…。
3．第三句中，“文字开始被刻在竹简上”的句子结构和上一句相同，翻译时可以用 instead代替相同的句子结构。
4．第四句中，“非常重，不便于携带”可以理解为“太重了以至于无法携带”，所以可使 用too…to…句型。
5．最后一句中，“在学习总结……发明了”可以翻译为两个并列的谓语，即learned from和invented。