常見(jiàn)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(zhǎng)，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(jiàn)的過(guò)敏原包括花粉，動(dòng)物皮屑，絨羽，螨類(lèi)，化學(xué)品，以及各種食品。 返回 down-feather