Yunmeng: Yunmengze, Canglang: Canglang River, a lake and a river, all water, right.
Wave to the universe: structurally, they are all parallelism words. From the part of speech and meaning, one is the sea, the other is the sky, and the sea is also right for the sky.
Wide to wide: structurally, they are all simple words, and in the sense of part of speech, they are adjectives and adjectives that describe space. . .
Couplets, regardless of rhyme. First of all, it is necessary to match parts of speech, that is, nouns to nouns. Further, the literal meaning of words must be correct and must belong to the same category, such as space, time, animals, plants and so on. This is a qualified couplet. Of course, it would be better if the word structure is correct. Words should be viewed from the unit of words. Generally, it is correct not to divide words into words.