While written manuscripts were used for teaching in medieval times, they were written on birch bark or palm leaves, until the advent of the printing press from the 16th century.

写下的手稿在中世纪被用来教学，写在白桦树皮和棕榈叶上，直到16世纪出现印刷机为止。

youdao

While written manuscripts were used for teaching in medieval times, they were written on birch bark or palm leaves, until the advent of the printing press from the 16th century.

写下的手稿在中世纪被用来教学，写在白桦树皮和棕榈叶上，直到16世纪出现印刷机为止。

youdao