docuseries       
noun [ C ] uk/ˈdɒk.jəˌsɪə.riːz/ us/ˈdɑː.kjəˌsɪr.iːz/
 (电视或电台)纪录片
a documentary series: a series of television or radio programmes that give facts and information about a subject or about real events
  A new docuseries focuses on the victims of the financier's crimes. 一部新的纪录片聚焦于金融家罪行的受害者。 
 - More examples
 - The pop star is starring in a new docuseries which will follow her daily life.
 - Here are 20 of the best docuseries currently available to stream on Netflix.
 - The docuseries tells the astonishing story of how a controversial cult built a new city in the American midwest.
 - He was contacted by a film-maker wanting to make a docuseries about his life and work.