down-feather

常见例句

• In a plumulaceous feather, barb ridges grow straight without any helical movement.
  在绒羽上，羽枝脊则直直生长，不做螺旋形移动。
• Common allergens include pollen, animal dander, down feathers, mites, chemicals, and a variety of foods.
  常见的过敏原包括花粉，动物皮屑，绒羽，螨类，化学品，以及各种食品。
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