in gear

with a gear engaged

齿轮连上，已啮合

the captain revved the engines and put them in gear.

机长加快发动机转速，使其进入工作状态。

I've got to get my act in gear.

我得采取行动了。

move up a gear

change to a higher gear

换挡提速

out of gear

with no gear engaged

齿轮脱开，不啮合

she took the engine out of gear.

她将引擎停下。

sometimes his brain seems to slip out of gear.

有时候，他的脑袋好像不听使唤了。

gear down (或 up)

change to a lower (or higher) gear

换低速（或高速）挡

gear someone for

make ready or prepared

使（某人）做好准备

a nation geared for war.

全国已经进入备战状态。

gear something to/towards

adjust or adapt something to make it suitable for (someone or something)

（为适应某人或某事）对（某物）进行调整（或改造）

gear someone/thing up

equip someone or something for a particular purpose

（为特定目的）装备（某人，某物）

a city not &B{geared up to} an outdoor lifestyle.

一个还没有为户外生活方式做好准备的城市。

gear up

To get ready for a coming action or event

为…准备好：为一将要发生的行动或事件做好准备

a group of investors who had geared up for the takeover fight.

已经为兼并做好准备的一群投资人