flight feather
US /ˈflaɪt ˌfeð.ər/
UK /ˈflaɪt ˌfeð.ər/
1.
飞羽, 翼羽
one of the large, stiff, and asymmetrical feathers on the wing or tail of a bird, essential for flight
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The eagle soared high, its powerful wings propelled by strong flight feathers.
老鹰高高翱翔，其强劲的翅膀由坚固的飞羽推动。
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Scientists study the structure of flight feathers to understand avian aerodynamics.
科学家研究飞羽的结构以了解鸟类空气动力学。