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。
The utility model is characterized in that the top of the center shaft is provided with a plurality of thin wing pieces in the axes direction of the center shaft.
其特征是在固定中轴沿固定中轴的轴线在中轴的顶端制出若干个薄的翼片。
The utility model is characterized in that the top of the center shaft is provided with a plurality of thin wing pieces in the axes direction of the center shaft.
其特征是在固定中轴沿固定中轴的轴线在中轴的顶端制出若干个薄的翼片。
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