What is the phrase "flying in the wind"?

Flying in the wind is an affirmative sentence, which modifies flying in the wind and is an adverbial of flying.

Fluttering with the wind refers to the state of dancing and fluttering in the wind, describing the national flag and other things fluttering in the wind. Yang means flying in the air. The national flags of the two countries fluttered in the wind, and the loud salute and the national anthems of the two countries echoed for a long time.