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It is said that certain trained people can tell by watching a recorded speech on video if the person is speaking by himself, or he is reading a manuscript using a machine called "teleprompter" like an announcer. Musical performance is also the same. Playing by heart is different from playing with a sheet of music.ある訓練された人たちは、録画されたスピーチを見るだけでその人が自分で話しているのか、...