The gear just would not come unstuck.

齿轮就是松不开来。

youdao

In the early 1400s came the invention of the coiled spring or fusee which maintained constant force to the gear wheels of the timekeeper despite the changing tension of its mainspring.

在15世纪早期，人们发明了螺旋弹簧或均力圆锥轮，尽管它的主弹簧的张力不断变化，但仍能对计时装置的齿轮保持恒定的力。

youdao

The device itself was right under the vehicle, almost in line with the gear lever.

这个装置本身就在车子下面，几乎与换挡杆成一直线。

《柯林斯英汉双解大词典》

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

The brakes worked well, and the gear settings operated just like on a standard bike.

BBC: Rent an electric bike in London

Never ignore hands and feet, and never underestimate the gear needed to cover them.

NPR: Subzero Biker Checks In

There are flaps in the plastic where quarantine workers insert insecticide bombs to fumigate the gear.

FORBES: Magazine Article