focuson聚焦子,聚焦碰撞focusn.焦点；焦距；中心v.（使）集中；聚集focused crawling主题爬行focusing adaptor对焦附加器focus constraint焦点约束focus adjustment调焦focusing theorem聚焦定理Focus Supersonic聚焦超声focus of control控制焦点focus axial error焦点轴向误差Focus measurement焦点测量focus-mask tube栅孔聚焦式显像管