/ˈæpətʃə(r) ||; ˈæpɚtʃɚ/noun[C] 1 (formal 正式) a small opening in sth 小孔；隙缝
2 (technical术语) a small opening that allows light to reach aLENS(= the small curved piece of glass or plastic that light passes through inside a camera) （照相机镜头的）孔径 ☞picture at camera 见 camera 插图