main landing gear的用法和樣例：
例句
- Braking is provided by four brake assemblies, one mounted on each main gear wheel.
剎車系統由四個剎車組件組成，一個安裝在每個主起落架艙。 - The stalky main landing gear struts retract forward into the engine nacelles.The nose gear retracts forward into a well ahead of the cockpit.
主起落架向前收入發動機艙，前起落架向後收入座艙前的艙室。
