/gɪə(r) ||; gɪr/noun1 [C] the machinery in a vehicle that turns engine power into a movement forwards or backwards （使车辆前进或后退的）传动装置: Most cars have four or five forward gears and a reverse. 大多数汽车有四个或五个前车档和一个倒车档。
2 [U] a particular position of the gears in a vehicle 车辆传动装置的位置；排檔: first/second/top/reverse gear 第一╱第二╱高速╱倒车档to change gear 换档
3 [U] equipment or clothing that you need for a particular activity, etc （进行某项活动所需的）装备，衣物: camping/fishing/sports gear 露营╱钓鱼╱体育用具
4 [sing] an instrument or part of a machine that is used for a particular purpose 工具；（机器的）装置: the landing gear of an aeroplane 飞机的起落架