这个机器的齿轮坏了。

The gear of this machine is broken.

汽车的齿轮需要润滑。

The gear of the car needs lubrication.

你能帮我调整一下这个齿轮吗？

Can you help me adjust this gear?

他正在修理自行车的齿轮。

He is fixing the gear of his bicycle.

机器内部有一个锥齿轮。

There is a bevel gear inside the machine.

这个玩具车的齿轮很精细。

The gear of this toy car is very delicate.

这辆车的齿轮系统需要修理。

The car's gear system needs to be repaired.

这个传动机构由多个齿轮组成。

This gear train consists of multiple gears.

锥齿轮通常用于差速器中。

The bevel gear is commonly used in differentials.

自行车的齿轮使爬坡更容易。

The bicycle's gear makes it easier to climb hills.