n. 1.【机械工程】齿轮，(齿轮)传动装置，齿链；排挡。 2.〔古语〕衣服；甲胄与武器。 3.家具；财物，动产。 4.工具，用具；马具；船具；【火箭】起落架。 5.〔英口〕胡说。 6.〔英口〕行为，事件。 短语和例子 bevel gear伞形齿轮。 bottom gear低速挡，末挡。 helical gear斜齿轮。 high gear【机械工程】高速挡〔口语〕高速度。 hunting gear打猎用具。 low gear【机械工程】低速挡〔口语〕低速度。 magnetic gear磁力离合器。 remote-control gear遥控装置。 reverse gear倒车挡；反向齿轮。 steering gear转向装置。 telemetering gear遥测装置。 top gear高速挡，末挡。 get [put] into gear ＝ throw into gear 开动机器；着手工作。 get out of gear ＝ throw out of gear 断开传动装置；使混乱。 in gear 1. (机器)开得动，运转顺利；情况正常。 2. (齿轮)搭上，联结上(发动机)。 in high gear 开高速齿轮，热烈地进行。 out of gear 1. (齿轮)脱开。 2. (机器)开不动；情况混乱，出毛病。 shift gears 1. 换挡，变速。 2. 改变方式[办法、调子]。 vt. 1.把齿轮装上(机器等)，使扣上齿轮；开动(机器等)。 2.给…装上马具 (up)。 3.使适合 (to)。 vi. 1.(齿轮)扣上 (into) (机器)开动。 2.适合，一致 (with)。 短语和例子 gear down 挂慢挡，减小速度。 gear level 挂平挡。 gear up 挂快挡，增加速度；促进。
a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion 同义词：gear wheel, geared wheel, cogwheel,
equipment consisting of miscellaneous articles needed for a particular operation or sport etc. 同义词：paraphernalia, appurtenance,
a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle) 同义词：gear mechanism,
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed; "the fool got his tie caught in the geartrain" 同义词：gearing, geartrain, power train, train,
set the level or character of; "She pitched her speech to the teenagers in the audience" 同义词：pitch,
A gear is a rotating machine part having cut teeth, or cogs, which mesh with another toothed part in order to transmit torque. Two or more gears working in tandem are called a transmission and can produce a mechanical advantage through a gear ratio and thus may be considered a simple machine.
例句与用法
1.
When a car is out of gear it cannot run . 汽车脱档后，就不能开动了。
2.
Put the gear lever in the neutral position . 把变速杆推到空档的位置。
3.
When the car is in gear it will move . 汽车挂上档以后，就可以开动了。
4.
Do not make the engine run fast when not in gear . 不要让发动机空转。
5.
The car started with a crashing of gears . 那汽车开动时发出挂挡的声音。
6.
Industry must be geared to wartime needs . 工业必须调整以适应战时需要。
7.
They picked up the gear from the boat . 他们把东西从船上捡起。
8.
They loaded their gear into the van . 他们把工具装上运货车。
9.
Pedrico is looking after the skiff and gear . 彼得利科在守着船和船上的东西。
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