The problem of sharp and rounded sounds is very important in dialects.
来自互联网
2. 黄河迁徙后，中间故道便成为两边语言的融合带、过渡带，也成为新乡方言入声和尖团音的分界线。
Since Yellow River had changed its riverway, the old drainage area became a mixed zone characterized both languages, and also marked the boundary between the accents of Jiantuan and Rusheng.
来自互联网
3. 黄河迁徙后，中间故道便成为两边语言的融合带、过渡带，也成为新乡方言入声和尖团音的分界线。
Since Yellow River had changed its riverway, the old drainage area became a mixed zone characterized both languages, and also marked the boundary between the accents of Jiantuan and Rusheng.
