When parking on a hill, leave the car in gear.

在斜坡上停车时把汽车挂上挡。

《牛津词典》

As soon as the driver puts the car in gear and touches the gas pedal, the engine starts back up.

司机一挂上挡，踩下油门踏板，发动机就重新启动了。

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The emphasis of current economic work is on getting the market in gear.

当前经济工作的重点是启动市场。

《新英汉大辞典》

The two brothers estimate they have more than $300,000 invested in fishing gear and equipment.

VOA: standard.2010.05.04

So in the summer of 2001, we decided to switch gear from a backend technology provider to a front-end consumer-oriented search service.

于是在2001年夏，公司决定从后台技术提供者,转变为直接面向消费者的搜索服务提供方。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

We sense food coming in, that sets into gear a series of metabolic and biological processes that are very interesting, and then of course once the food gets in the body it does lots of interesting things-- some good things and some bad things.

美食当前,食指大动,身体从而启动一系列新陈代谢过程,和有趣的生物过程,而且,当食物进入身体,它就产生许多有趣的效应,这些效应有好有坏

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

Put the key in the ignition and get your career in gear with social web engagement.

FORBES: Women Lead the Way on Social Networks

Citigroup (NYSE:C) has been basing and tried to get back in gear Friday.

FORBES: January Looked Good For Stocks, But Here Comes Washington Again

He could have called Monica Lewinsky immediately, but he waited seven days because he needed to make sure the job situation was in gear.

CNN