名词
中文翻译：方向发射器
同义词：
['定向发射器，定向天线例句：1. The directional transmitter was used to send signals over long distances.（定向发射器被用来远距离发送信号。）']
例句：
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1. The directional transmitter was used to send signals over long distances.
定向发射器被用来远距离发送信号。
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2. The directional transmitter helped to improve the quality of the broadcast signal.
定向发射器有助于提高广播信号的质量。
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3. The directional transmitter was designed to be easily mounted on a vehicle's roof.
定向发射器设计得可以方便地安装在车辆的屋顶上。