The grass grows and the orioles fly, is an idiom,

Word: The grass grows and the orioles fly

Pinyin: cǎo zhǎng yīng fēi

Definition: Oriole: Oriole. Describe the scenery of late spring in the south of the Yangtze River.

Source: Liang Qiu Chi's "Book with Chen Bo" of the Southern Dynasties: "In late spring in March, grass grows in the south of the Yangtze River, there are mixed peanut trees, and flocks of orioles fly around."

Example: like this It seems that the fragrance of flowers and the singing of birds are all the language of nature.

(Zhu Kezhen's "The Language of Nature")