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humming
A hum is a sound made by producing a wordless tone with the mouth opened or closed, forcing the sound to emerge from the nose. To hum is to produce such a sound, often with a melody.
A hum has a particular timbre (or sound quality), usually a monotone or with slightly varying tones. There are other similar sounds not produced by human singing that are also called hums, such as a sound produced by machinery in operation or by an insect in flight. The hummingbird was named for the sound that bird makes in flight.
==Mechanics==
A 'hum' or 'humming' by humans is created by the resonance of air in various parts of passages in the head and throat, in the act of breathing. The 'hum' that a hummingbird creates is also created by resonance: in this case by the passage of air against wings in the actions of flying, especially of hovering.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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