Please explain what is the pitch law, what is the vocal rhythm and what is the leveling law? It is better to have concrete examples to illustrate. . . thank you

Tone law is a rhythm in which equal syllables or equal steps appear alternately regularly, forming an equal-length sequence and sound space in the phonetic chain. The most obvious expression of intonation law is poetry, especially poetry with word equivalence.

For example, Du Fu's Farewell: Los Angeles/Farewell/Four Thousand Li,/Long Drive/May 6th/Year. Vegetation/decay/swords and shadows/outside, fighting/blocking/old river/edge

Flat rhythm, that is, the flat rhythm with pitch elements as the main factor alternates with each other regularly or the flat rhythm of the upper and lower sentences appears relatively, thus forming the flat rhythm in the phonetic chain. Since the Tang Dynasty, the four-tone binary law of opposition has been adopted, and the flat sound, up, down and in are divided into two categories, which constitutes the actual opposition between flat sound and non-flat sound.

Acoustic rhythm is the periodic combination of the similarities and differences of phoneme timbres, such as syllables and different syllables, the same initial and different initial, the same vowel and different vowels, which forms the acoustic rhythm formed by the regular alternation of the same timbre and different timbres.