In addition, the "angle" of the "role" should be jio2 in ancient times. Later, in the north, the white pronunciation of O was changed to ao, while the text reading (that is, pronunciation) was changed to E, which caused great confusion. Although * * * and China stipulate that "role" should be pronounced as "Jue Se", the pronunciation of "role" conforms to "Zhongyuan Rhyme".