What you're looking for is the electromagnet (solenoid). which turns the first gear in the gear train.

你要找的是电磁体（螺线管），在传动机构中驱动第一齿轮。

youdao

Move up a gear as soon as possible –if traffic conditions allow, slip into a higher gear.

尽快抬高车档-如果交通状况允许的话，把车档抬高。

youdao

Move up a gear as soon as possible - if traffic conditions allow, slip into a higher gear.

尽快抬高车档-如果交通状况允许的话，把车档抬高。

youdao

But over time, we slowly got used to it and we try to make it as kid friendly as possible because kids are what we gear towards and they're the most important people that come through."

VOA: special.2010.07.28

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

So I made the decision to switch gear and become a consumer-oriented search site.

所以我决定将公司转型,成为一家客户导向型的搜索网站。

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

Metal Gear Rising is an attempt to reboot the storied Metal Gear franchise into something wholly different.

FORBES: Metal Gear Rising: Revengeance Review

The RAIB found the locomotive changed direction because its screw reverser moved from reverse gear to forward gear.

BBC: Robert Lund

There will be communications gear so that I can transmit stories and images, and also the usual camping gear.

BBC: Paul Salopek: Going for a seven-year walk