Dimeter refers to the rhythmic unit in poetry
Generally speaking, dimeter refers to a word with two words, and monometer is one word. For example: The day ends by the mountain, then it is the day//by the mountain//ends, which is the ending monometer. Generally speaking, as you said, monometer often appears in the middle or at the end of a five-character poem. For example, "The desert//solitary smoke//is straight, the long river//the setting sun//is round". If we insist on placing the monosyllable step at the beginning, it will form the characteristics of the word: "Look at // Wu hook //, beat the railing // all over."
As for seven-character poems, they often have a 223 structure, such as: "The wind is rushing//The sky is high//Ape roars/Ai". The apes' roars here can also be divided into apes/Ai's screams. Of course, there are exceptions: "Thirty thousand miles // the river // flows into the sea in the east, and five thousand miles // the mountains // go up to the sky." So this sentence itself can feel steep when read
In fact In Chinese, a syllable or a combination of multiple syllables will form a "pause", and the pause is a sound step. For example: I urge you to drink more//a glass of wine. These pauses are musical steps.
The division of syllables needs to take into account two aspects:
1. The semantics are complete, that is, the premise of pause, it needs to be Chinese or the Chinese words need to be a complete expression of meaning.
2. The syllables are complete, and common poetry forms, such as four-character, five-character, and seven-character, have long formed fixed forms of foot division, such as four-character and two-stop (2-2 sentence patterns), Three pauses in five words (2-2-1 or 2-1-2 sentence pattern), four pauses in seven words (2-2-2-1 or 2-2-1-2 sentence pattern)
The above is a brief explanation of the meter in ancient poetry