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focusing ring /ˈfəʊkəsɪŋ ˈɹɪŋ/ n

中文：调焦环

中文 · 调焦环Español · anillo de enfoqueFrançais · bague de correction dioptrique
Meaning：Ring on each eyepiece for manually correcting for the difference between the user’s eyes.
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Binoculars

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