beam

/bim/

a signal transmitted along a narrow path; guides airplane pilots in darkness or bad weather

中文释义：无线电波束；导航信号

The pilot relied on the radio beam to land safely in the fog.

飞行员依靠无线电波束在雾中安全着陆。

Airports use a directional beam to guide planes during poor visibility.

机场使用定向波束在能见度低时引导飞机。