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middle primary covert /ˈmɪdəl ˈpɹaɪməɹi kəʊvˈɜːt/ n

中文：中初级覆羽

中文 · 中初级覆羽Español · coberteras primarias mediasFrançais · moyenne tectrice primaire
Meaning：Short feather covering the base of the secondaries; it maintains the body’s internal temperature and allows air to glide over the wing.
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Bird wing

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