What are squeaks and peaceful sounds?

There are four tones of each word: flat, up, down and forward. In addition to the flat tone, the upper, lower and middle tones all belong to the Nuo tone. But we should know that the flat sound itself can be divided into "flat sound" and "flat tone" For example, "Fang" is a level tone, and "Fang" is a level tone. As for the three tones of up, go and in, there is no distinction between yin and yang. To put it more clearly, it is to divide the tones of all words into Yin Ping, rising tone, Shang, Qu and Ru (hereinafter referred to as Yin and Yang, Shang, Qu and Ru); Every word, if not flat, belongs to a weak sound (that is, up, down and middle). For example, the word "Yin" itself is a flat tone; The word "Yang" is the upper sound, and the word "Shang" is the upper sound; The word "go" is to go to the sound; The word "Ru" means Ru Sheng. If you are familiar with these four tones, people can easily tell that every word belongs to Zhu Ping.