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How to distinguish between plain and plain, simple and popular?
Distinguish the flat tone: the first sound and the second sound are flat tones; The third and fourth sounds are ligatures.

"Flat" is straight, and "flat" is tortuous. There are four tones in Middle Chinese, which are called Ping, Shang, Qu and Ru. Except flat tone, rising tone, falling tone and entering tone, they are collectively called falling tone.

The ancient word "flat sound" is high, flat and long, consistent from beginning to end, and does not rise or fall; The pronunciation of the word "Cuosh" is uneven, rising or falling, turning or short (such as entering tone). Words with flat tones are used alternately in poetry according to certain rules, which can make sentences have cadence musical effect and give people a sense of beauty in sound when reciting.

Expanding the theory of data leveling is like dividing the students in four classes (four tones) into two categories according to gender (leveling). As for whether this division is even, it is not considered by levelers.

Take Putonghua as an example, * * * has four tones: the flat tone is Gao Pingtiao (it is called flat if it doesn't rise or fall); The upper voice is a rising tone (not high or low); The rising tone is a low rising tone; Voiced is a high tone.

In Chinese, even words refer to the speed of speech. Vowel A is pronounced loudly as A and quietly as A. In the case of similar decibels, A sound is brighter than O sound. Because a's opening is big. Therefore, a fair and light sentence is not established.

The reason why there is a dispute between the theory of leveling and the theory of compromise is that the academic circles have no practical understanding of leveling. Mathematically, leveling is based on incomplete induction.

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