undercarriage
n. 飞机起落架，着陆装置；底盘
复数 undercarriages
例句
The undercarriage was fully retracted.
起落架被完全收起。
《牛津词典》
The pilot found that the undercarriage could not be retracted.
驾驶员发现飞机的起落架不能缩回。
All it requires are some minor changes to the front undercarriage.
唯一要做的不过是对前起落架做一些微小的改动。
