1 (informal 非正式) a person who flies a plane (usually a small one, not a passenger plane) 飞行员（通常驾驶非客机的小型飞机）

2 a person who travels in a plane as a passenger （飞机）乘客: frequent flyers 经常乘飞机的人

3 a thing, especially a bird or an insect, that flies in a particular way 飞行物（尤指鸟类或昆虫）: Ducks are strong flyers. 野鸭有很强的飞行能力。

4 a small sheet of paper that advertises a product or an event and is given to a large number of people 广告传单

5 (informal 非正式) a person, an animal or a vehicle that moves very quickly 飞快移动的人、动物或车辆