A tiny feathered "thumb," the alula, improves flight control. The protruding shaft on the first wing feather makes a loud, rustling sound—adding acoustics to the visual display.
微小的拇翼改善了对飞行的控制能力，第一翼羽上的凸出轴结构会发出沙沙的响声——在保持视觉效果的同时还增添了声学效果。
The protruding shaft on the first wing feather makes a loud, rustling sound—adding acoustics to the visual display. At Peabody Museum of Natural History, Yale University
微小的拇翼改善了对飞行的控制能力，第一翼羽上的凸出轴结构会发出沙沙的响声——在保持视觉效果的同时还增添了声学效果。
A tiny feathered "thumb," the alula, improves flight control. The protruding shaft on the first wing feather makes a loud, rustling sound-adding acoustics to the visual display.
微小的拇翼改善了对飞行的控制能力，第一翼羽上的凸出轴结构会发出沙沙的响声——在保持视觉效果的同时还增添了声学效果。
If the feather is too stiff to wrap around the shaft of the arrow, you can soften it by steaming it.
如果因为羽毛太硬而无法缠绕在箭轴上，你可以用蒸汽使羽毛软化。
If the feather is too stiff to wrap around the shaft of the arrow, you can soften it by steaming it.
如果因为羽毛太硬而无法缠绕在箭轴上，你可以用蒸汽使羽毛软化。
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