Main gear is made of spring aluminum.

主要齿轮是春天的铝。

youdao

Postflight check found L main gear exposed threads due wearing.

航后检查发现左主轮磨损见线。

youdao

Braking is provided by four brake assemblies, one mounted on each main gear wheel.

刹车系统由四个刹车组件组成，一个安装在每个主起落架舱。

youdao

The AAIB said that the captain had inspected the right main landing gear before the flight and had not noticed any abnormalities.

BBC: Flybe plane passengers 'saw wheel fall off'

The pilots then use their usual controls to steer with the nose wheel (which in turn steers the TaxiBot) and to brake with the main landing gear.

ECONOMIST: A cheaper, cleaner way for the long taxi to the runway

Automated functions are intended to be linked with small electric drives attached to the main landing gear, which would provide power to move planes instead of relying on engines that burn expensive jet fuel.

WSJ: Honeywell Tests Autopilots for the Tarmac