bi·plane /ˈbaɪˌplen/
雙翼飛機,複翼飛機
Bi·plane n. Aëronautics An aëroplane with two main supporting surfaces one above the other.
Bi·plane, a. Aëronautics Having, or consisting of, two superposed planes, aërocurves, or the like; of or pertaining to a biplane; as, a biplane rudder.
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biplane
n : old fashioned airplane; has two wings one above the other