How to treat the flat sound and oblique sound in poetry

The four tones of Chinese characters are divided into two categories: flat tone and flat tone. The first sound (flat sound) and the second sound (flat sound) are collectively called flat sound. There is no fluctuation in the flat sound, which is relatively long. The third tone (rising tone) and the fourth tone (falling tone) are collectively called tones. Words with old sounds are also classified as sounds. It means inclined, which means uneven. The word "flat" is very important in the arrangement of poems, and all metrical poems are flat. Although ancient poetry is not so strict in its requirements for flat tones, in general, it should be properly arranged to make the tone of the poem ups and downs, musical and catchy. How are the flat tones in metrical poems staggered? For example, the fifth and sixth sentences of Chairman Mao's Seven Laws "Long March" say, "The Jinsha River is warm with clouds and cliffs, and the Dadu Bridge is cold with iron." Its flatness is "flat, flat, flat." Every two words have a rhythm. In the flat sentence, flat is followed by flat, flat is followed by flat, and the last word is flat. But the first sentence is flat tone followed by flat tone, followed by flat tone, and the last word is flat tone. This is leveling alternation. In five words: A: Pingping Pen B: Pingping Bi A: Pingping Pen B: Pingping Pen Seven Words is to add two opposite syllables in front of five main words: A: Pingping Pen. The third and fourth tones. Don't die too much. After all, dialects have influenced the pronunciation at that time and have changed. For example, the country is now a sound, which used to be broken, that is, a sound with a strange sound.