retractable-gear aircraft

例句：

1. 1. The new model of the aircraft is equipped with retractable gear for easy maintenance.
   这款新型飞机配备了可收放式齿轮，便于维护。
2. 2.The pilot demonstrated how to operate the retractable gear on the aircraft.
   飞行员演示了如何操作飞机上的可收放式齿轮。
3. 3.In emergency situations, the retractable gear can be quickly deployed to provide additional lift.
   在紧急情况下，可收放式齿轮可以迅速部署，提供额外的升力。