radar

Air traffic controllers use advanced radar to track the position of every airplane in the local airspace.

(Chinese) 空管员使用先进的雷达来追踪当地领空内每一架飞机的位置。

The ship's radar detected an iceberg hidden in the thick fog three miles away.

(Chinese) 船上的雷达探测到了三英里外隐藏在浓雾中的冰山。