The debate on official historian between Han and Liu occurred in the early 9th century, Yuan he year of Tang Xianzong Reign Period.
韩愈和柳宗元关于史官问题的辩论，发生于九世纪初唐宪宗元和年间。
Porcelain was made as early as the 9th century.
早在公元9世纪就产生了瓷器。
The technique of printing was known to the Chinese as early as the 9th century.
早在九世纪，中国人就已经掌握了印刷术。
The technique of printing was known to the Chinese as early as the 9th century.
早在九世纪，中国人就已经掌握了印刷术。
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