手动调焦旋钮
/ˈmanjuːəl ˈfəʊkəsɪŋ ˈnɒb/
n
English: manual focusing knob · 手动调焦旋钮
English · manual focusing knobEspañol · botón de enfoque manualFrançais · bouton de mise au point manuelle
释义：Knob for manually adjusting the sharpness of the image projected on the screen.