sighting
n.
1.照准；观察；视线
1.照准；观察；视线
- sighting mark error
照准误差 收藏 - optical sighting device
光学照准器 收藏 - cross hair or crosshair: Either of two fine strands of wire crossed in the focus of the eyepiece of an optical instrument and used as a calibration or sighting reference.
"十字丝:呈十字形交叉于光学仪器的目镜焦点上的两根细丝之一,用于校准或瞄准参考." 收藏 - An indicator or a sighting apparatus on a plane table, used in angular measurement.
旋标装置飞机控制板上的指示器或观测仪，用来测量角度。收藏
开心词场背单词
名词解释：