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　　American film critic Elvis Mitchell’s kal@江苏彩铃@eidoscopic documentary creates a definitive narrative of the Black revolution in 1970s cinema, from genre films to social realism—a work of painstaking scholarship t@何以笙箫默 电影@hat’s also thoroughly entertaining, an essential archival document and testament to a period of American f@黄金彩虹@ilm history unlikely to be repeated.