普通话的定义在早期规范了我们的语音发声,即以北京语音为标准音,以北方话为基础方言,以典范的现代白话文著作为语法规范的现代中华民族共同语。1但是在不断地实践过程当中,北方话和南方话的差异性就日益显现。比如说,在普通话中北方平舌音是抵住上齿背进行发音,而在南方普通话中却是抵住下齿背进行发音。 The definition of Putonghua standardized our pronunciation of voices early, that is, the standard pronunciation of Beijing dialect, the northern dialect as the basic dialect, the typical modern vernacular Chinese as the grammatical standard Chinese common language. However, in the process of continuous practice, the difference between North dialect and South dialect becomes increasingly apparent. In Mandarin, for example, flat tongues in the north are against the upper teeth and pronounced in the south while they are against the lower teeth.