scalelike structure between the base of the wing and the halter of a two-winged fly
tuft of small stiff feathers on the first digit of a bird's wing
双语例句
1. 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.
2. 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.
3. 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.
