The system consists of a device pair - optical data sender and receiver.
该系统包括一对设备——光学数据发送器和接收器。
2
Assistant: What about this pair? They are the "in" things now in optical wear. Try them on.
售货员：这副眼镜怎么样？它们是时下最流行的光学用品，试试吧。
3
The attack helicopter, designated Zhi-9W (Z-9W), features a pair of external weapon pylon and a roof-mounted optical sight for target searching and tracking in daylight.
攻击直升飞机指定为直- 9w (Z - 9w)，特征是一对外部挂架和一套顶部安装瞄准具用于昼间目标搜索和跟踪。