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central focusing wheel /ˈsɛntɹəl ˈfəʊkəsɪŋ ˈwiːl/ n

中文：中央调焦轮

中文 · 中央调焦轮Español · rueda central de enfoqueFrançais · molette de mise au point
Meaning：Focusing ring for both the objective lenses; it is used to manually adjust the sharpness of the image.
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Binoculars

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