自秦汉以来,中国一直是世界东方的大国,历代中原皇朝直接统治的疆域一直维持在数百万平方公里。至18世纪中叶清朝完成统一,中国的疆域超过一千二百万平方公里。19世纪中叶,在帝国主义的侵略和宰割下,中国丧失了大片领土。 Since the Qin and Han dynasties, China has always been a great power in the east of the world. The territory directly ruled by the Central Plains dynasty has maintained its position in millions of square kilometers. By the middle of the eighteenth century, the Qing Dynasty unified its reunification with more than 12 million square kilometers of China's territory. In the mid-19th century, China lost a large part of its territory under imperialist aggression and slaughter.