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tertial /ˈtɜːʃəl/ n

中文：三级飞羽

中文 · 三级飞羽Español · remeras terciariasFrançais · rémige tertiaire
Meaning：Rigid feather of flight inserted into the inner portion of the wing; it helps to decrease air turbulence.
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Found in these illustrated scenes（2）

Bird wing Contour feather

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