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It was invented by Cai Lun.
是蔡伦发明的.
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Cai Lun was dissatisfied.
蔡伦深感不满.
A court official named Cai Lun was determined to develop a new and better writing material.
当时一位名叫蔡伦的宦官决定发明一种更新更好的书写材料.
英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。