From the historical point of view, Hakka dialects' laws of phonetic evolution can be discovered contrasted with Guangyun, including 12 initials' features, 16 finals' features and 5 tones' features.
2
第四章对石门方言音系与中古音的声母、韵母、声调做了比较。
The forth chapter is the comparison between phonological system of Shimen dialect and the Middle Age phonetics in initials, finals, tones.