无线电射束也象探照灯的光束一样，是不能高度集中的；它总要散开。

Like the searchlight beam, the radio beam cannot be made very sharp; it tends to spread.

youdao

无线电射束也象探照灯的光束一样，是不能高度集中的；它总要散开。

Like the searchlight beam, the radio beam cannot be made very sharp; it tends to spread.

youdao