radio frequency beam

例句：

1. 1. The radiofrequency beam was used to transmit signals acrossthe city.
   无线电频率束被用来在城市中传输信号。
2. 2. The scientist used aradio frequency beam to scan the area forany signs of life.
   科学家使用一个无线电频率束来扫描这个区域，寻找任何生命的迹象。
3. 3. The beam of light fromthe laser was directed towards the target.
   激光的光束被指向目标。