Zhè / bù / jì / lù / piàn / jiè / shào / le / láo / dòng / gǎi / zào / zhì / dù / de / lì / shǐ / bèi / jǐng。这部纪录片介绍了劳动改造制度的历史背景。This documentary introduces the historical background of the reeducation-through-labor system.