从浩瀚的书海中，我认识了中国上下五千年的文明；

From the vast sea of books, I know up and down five thousand years of Chinese civilization;

youdao

从浩瀚的书海中，我认识了中国上下五千年的文明；

From the vast sea of books, I know up and down five thousand years of Chinese civilization;

youdao