1. a retractable fin keel used on sailboats to prevent drifting to leeward. 
   帆船上用于防止向下风向漂流的鳍板。
2. The distance between the ground and the undercarriage of an automobile. 
   离地间隙从地面到汽车底架之间的空间
3. The undercarriage on light aircraft do not always retract in flight. 
   轻型飞机飞行时起落架不一定缩回。
4. The undercarriage on light aircraft does not always retract in flight. 
   轻型飞机飞行时起落架不一定缩回.
5. An undercarriage or stand on which a device rests while in service. 
   底座在使用时将设备固定在其上的底座或支撑物

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• 1. 可收放的起落架
  retractable steel rule 钢卷尺...retractable undercarriage 可收放的起落架...retractile bridge 伸缩桥
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