down feather
英漢例句
- In a plumulaceous feather, barb ridges grow straight without any helical movement.
在羢羽上，羽枝脊則直直生長，不做螺鏇形移動。 - Common allergens include pollen, animal dander, down feathers, mites, chemicals, and a variety of foods.
常見的過敏原包括花粉，動物皮屑，羢羽，蟎類，化學(xué)品，以及各種食品。