单语范例（未经PONS编辑处理）
英语
- The substance that they spread on the eggs with their bills and belly feathers comes from their uropygial, or preen glands.www.wildlifeextra.com
- They rub the backs of their heads on their preen glands to pick up an oily secretion, which they transfer to their plumage to waterproof it.en.wikipedia.org
- Apart from ingesting the material, they also chew it, mix it with preen gland oil and apply it to their feathers.en.wikipedia.org
- They have dense plumage with a large preen gland for waterproofing their feathers.en.wikipedia.org
- Its sternum has no keel, its wings are minimal, and it has no preen gland.en.wikipedia.org
- Like cormorants, they have a vestigial preen gland and their plumage gets wet during diving.en.wikipedia.org
- They have no feather vanes, which means they do not need to oil their feathers, hence they have no preen glands.en.wikipedia.org
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英语