Yunyou Yuji
It describes the love between men and women.
Idioms and allusions
It's from the single edition of "Jiao PA Ji · marriage" of Ming Dynasty: "I falter when birds sing and flowers fall, and he pities and protects each other. I'm desolate, and he's more than ready. "
Discrimination of words
Idiom usage: used as predicate and attribute; used in written language
Yunyou Yuji
to separate the bones and use them as fire-wood in famine - xī hái yǐ cuàn
The battle between the ant and the snail - yǐ dòu wō zhēng