He made great contribution to humankind for his invention of paper-making technique.
He made great contribution to humankind for his invention of paper-making technique.
蔡伦对人类最大的贡献足发明了纤维纸及其造纸术。
He made great contribution to humankind for his invention of paper-making technique.
蔡伦对人类最大的贡献足发明了纤维纸及其造纸术。