磨灭

蔡伦改进的造纸术作为中华古代四大发明之一，为世界文明的文字记录与文化传播作出了不可磨灭的贡献。

cài lún gǎi jìn de zào zhǐ shù zuò wéi zhōng huá gǔ dài sì dà fā míng zhī yī, wèi shì jiè wén míng de wén zì jì lù yǔ wén huà chuán bō zuò chū le bù kě mó miè de gòng xiàn.

Cai Lun's improved papermaking technology, as one of the four great inventions of ancient China, has made an indelible contribution to the written records and cultural dissemination of world civilization.