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primaries /ˈpɹaɪməɹiz/ n

中文：初级飞羽

中文 · 初级飞羽Español · remeras primariasFrançais · rémige primaire
Meaning：Rigid feather of flight inserted into the outer portion of the wing; it provides propulsion.
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Found in these illustrated scenes（2）

Bird wing Bird anatomy

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