介音u是广州话的语言事实

Medial -u- Does Occur in Cantonese

声谱图及实验语音学数据证明,广州话和普通话一样存在u介音。从历史音韵看,广州话也没有弃失u介音的可能。因此,所谓广州话无介音的认识是不符合语言事实的。

The fact of sound spectrograph and experimental phonetics shows that the medial -u-does occur in Cantonese, as same as Putonghua. It's impossible for Cantonese to lose the medial -u-from the historical phonetics point of view. So, it's not a fact for Cantonese without the medial -u-.