Main gear is made of spring aluminum.

主要齿轮是春天的铝。

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Postflight check found L main gear exposed threads due wearing.

航后检查发现左主轮磨损见线。

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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。

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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

Main.net's gear already serves 10, 000 European homes at speeds of 500 kilobits a second, roughly equal to average cable and digital subscriber line (DSL) speeds, but a tenfold increase over standard dial-up modems.

FORBES: Tilting at power lines