到1952年，航空局开启了第一个正式的雷达进离场管制。

By 1952, the agency had begun its first routine use of radar for approach and departure control.

youdao

到1952年，航空局开启了第一个正式的雷达进离场管制。

By 1952, the agency had begun its first routine use of radar for approach and departure control.

youdao