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muteness
Muteness or mutism () is an inability to speak often caused by a speech disorder, hearing loss, or surgery. Someone who is mute may be so due to the unwillingness to speak in certain social situations.
==Causes==
Those who are physically mute may have problems with the parts of the human body required for human speech (the esophagus, vocal cords, lungs, mouth, or tongue, etc.).
Trauma or injury to the Broca's area of the brain can cause muteness.〔http://medical-dictionary.thefreedictionary.com/Aphasia〕
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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