重点介绍了中俄恰克图互市中，乾隆年间三次闭关与大黄贸易的联系与制约，以及贸易在曲折中的发展情况。
It describes the reign of Emperor Qianlong three closed-door trade links with the rhubarb and constraints , and trade developments of the twists and turns .
恰克图互市