腹就是韵母中的韵腹，通常是由发音最响亮的母音来充当，字腹的延长就是指这个母音。如果字头的发音“咬字，”那么字腹的发音延长（包括字尾收音）则是“吐字，”吐字主要是由声带的振动口腔依据“四呼”的状态打开和共鸣腔体的运用，使歌唱的声音得到扩大、美化。
字头、字腹、字尾三者的发声应与语音两方面同时训练，不可忽视任何一方。
A singer cannot practise voicing character head, character center and character ending only, she should also include the characters phonetic practicing in her schedule.
十字隆凸通常位于上、后半规管壶腹嵴的中部，与壶腹嵴的长轴垂直。
Usually being located at the middle of the cristae of vertical semicircular canals, the eminentia cruciata protrudes perpendicularly to the long axis of the crista.
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