down feather
英漢例句
- In a plumulaceous feather, barb ridges grow straight without any helical movement.
在絨羽上，羽枝脊則直直生長，不做螺旋形移動(dòng)。 - 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(dòng)物皮屑，絨羽，螨類，化學(xué)品，以及各種食品。