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aileron

noun
🔊/ˈeɪlərɒn/
🔊/ˈeɪlərɑːn/
 (specialist)
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  1. a part of the wing of a plane that moves up and down to control the plane’s balance（飞机的）副翼
    Topics Transport by airc2
    Word Originearly 20th cent.: from French, literally ‘small wing’, diminutive of aile, from Latin ala ‘wing’.