Embedding is actually a word game, embedding specific words or characters in poems, but in most cases the meaning in the poem is not the original meaning, more often it is the name of a person, place, Drug names, because these words are more likely to have ambiguous meanings and are convenient for nesting. For example: "[Qianhu (Tonghu)] back lake water, early summer [Pinellia] cool. Night [Lan (Tonglan) fragrance] dreams are broken, a wild goose [du (Tongdu) Heng] Yang." Among them, Qianhu , pinellia, orchid and Duheng are the four traditional Chinese medicines, but they are not used as medicine names in the poem. This technique is nesting.