half gainer

例句：

1. 1.The half gainer is a device thatdoubles the signal strength of a radio.
   半增益器是一种使无线电信号强度加倍的设备。
2. 2. The half gainer was used toimprove the signal quality in the old telephonenetwork.
   半增益器被用来改善旧电话网络的信号质量。
3. 3. The half gainer wasa revolutionary invention that changed the way wecommunicated.
   半增益器是一项革命性的发明，改变了我们沟通的方式。