flutter

n. 摆动,鼓翼,烦扰
v. 摆动,鼓翼,烦扰

Banners fluttered in the breeze.

旗帜在微风中飘扬。

She fluttered her handkerchief from the train window as a good-bye.

她从火车窗口里伸出手挥动手帕道别。