通常失去语言能力的人，简称听障人士，皆因听觉系统或发音系统发生障碍造成。
Usually, hearing system or vocal organs occurring obstacle cause all the people who lose his speaking ability, called for short hearing handicap.
因为发音系统大部分是软组织，无缘变成化石，现存的化石也只能告诉我们一点呼吸道的形状。
Fossils can only tell us so much about the shape of the vocal tract because much of it is soft tissue.
图卡诺安语的发音系统包括简单的辅音和几个鼻化元音，并不像尤比克语和! Xóõ语那么难。
It has a sound system with simple consonants and a few nasal vowels, so is not as hard to speak as Ubykh or !Xóõ.
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