释义
n. 拍打,拍打声,副翼 v. 拍打,鼓翼而飞,飘动
例句
1. The curtains were flapping at the open window. 窗帘在敞开的窗户前摆动。 2. A flap from the tail of the whale upset the boat. 鲸尾轻轻一拍便把小船打翻了。