... 天线焦距 focal length， antenna 焦面场focal plane field 椭圆焦点 focus of ellipse ...
双语例句
1
Focus: plane of focus; focal length; and depth of field.
焦距：焦点平面，焦距和景深。
2
The field of view can be limited by inserting a stop in the focalplane of microscope.
可以在显微镜的焦平面上加装一光阑，从而限制视区。
3
A staring imaging laser detecting and warning system is formed by using 4-channel uncooled infrared focalplane detectors, large field optical system, narrow band filters and signal processing system.