Some 4,000 years have gone by since the collapse of these primitive communes and the transition to class society,which took the form first of slave and then of feudal society.

• 而从原始公社崩溃，社会生活转入阶级生活那个时代开始，经过奴隶社会、封建社会，直到现在，已有了大约四千年之久。