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manual focusing knob /ˈmanjuːəl ˈfəʊkəsɪŋ ˈnɒb/ n

中文：手动调焦旋钮

中文 · 手动调焦旋钮Español · botón de enfoque manualFrançais · bouton de mise au point manuelle
Meaning：Knob for manually adjusting the sharpness of the image projected on the screen.
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Slide projector

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