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focusing knob /ˈfəʊm ˌɪnsjuːlˈeɪʃən/ n

中文：调焦钮

中文 · 调焦钮Español · botón de enfoqueFrançais · bouton de mise au point
Meaning：Adjusting device that makes it possible to obtain a clear image of the object.
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Found in these illustrated scenes（1）

Reflecting telescope

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