focusn.焦点；焦距；中心v.（使）集中；聚集focus plane焦平面focus drive集中驱动Focus groupn.焦点小组；中心小组focused ray聚焦光线focuscenter焦心点focus exact正焦点, 准确焦点focus servo聚焦伺服focus glass调焦玻璃focused jet聚向射流focus level焦点水平,聚焦程度