According to Rabiger (2014), I learned that documentary is a film or TV art form that takes real life as the creation material, real people and real events as the expression object, and carries out artistic processing and presentation on it. It takes the reality as the essence, and triggers people’s thinking with the reality. The core of documentary is truth. The birth of film began with the creation of documentaries. Besides, the documentary is not only to show the reality, but also to convey the spirit, warn the danger, teach the betrayal of human nature and encourage us to have ideals. At the same time, documentaries are often critical and bring people thinking. According to Biewen (2017), although blog was created by the Internet, it was also gradually replaced by rich visual culture due to its rapid development, such as TV, film and video. But radio has not been completely taken over by these new industries. Because audio can better support people’s listening, it does not affect what people need to see and what they need to make. More importantly, audio is often more effective than video to improve people’s recognition, it is more friendly and inclusive.
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