down-feather

常见例句

• 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，化學品，以及各種食品。
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