And a trend of devocalization in sonant can also be found.
辅音清浊对立逐渐消失，有浊音清化的趋势。
2
It is difficult to synthesize the sonant in the speech synthesis especially in the synthesizing diphthong in speech synthesis.
语音合成中以浊音合成为难点，尤其是在做多元音合成时尤为突出。
3
Mixed excitation model can extract the pitch better and describe the pitch wave better, so it has the capability of describing the excitation of sonant.