Please help me understand a poem about marriage.

This is a sentence in Guiguzi's Fatalism and Fractional Life, and it is one of the divinatory symbols. Just like the hexagrams in the Book of Changes, such hexagrams actually existed in the ancient vernacular. The explanation is actually very simple, that is, marriage is mediocre and tasteless, but it has always been together. Baiping Polygonum cuspidatum is two kinds of plants. Baiping is often said to meet by chance, and Polygonum cuspidatum is often said to be lush. In the poem, flying to a wetland full of two common plants indicates that marriage is ordinary! !