| 单词 | uropygial gland |
| 例句 | Among the substances produced by birds are the secretions of the uropygial gland, which may be pigmented orange, red or yellow. Beauty From the Bottom Up 2010-10-27T15:55:00Z They then looked for the pigments that may tinge the plumage both in the secretions of the uropygial gland and on the surface of feathers. Beauty From the Bottom Up 2010-10-27T15:55:00Z |
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