zài / zhè / bù / lì / shǐ / jì / lù / piàn / zhōng / zhuān / jiā / jiè / shào / le / bō / xuē / jiē / jí / de / xíng / chéng / guò / chéng

在这部历史纪录片中，专家介绍了剥削阶级的形成过程。

In this historical documentary, experts explain how the exploiting class developed.