piston transmitter的用法和样例：
例句
- A cellphone is a miniaturized radio receiver and transmitter, and the health concerns focus on the radio waves it gives off.
手机电话是袖珍的无线电接收器和传送器而且人们对健康的关注集中在它所释放的无线电波。 - These electric currents, caused by the received radio waves, are equal to the currents that originally generated the radio waves in the antenna of the transmitter.
因收到无线电波而引起的这些电流等于在传送器的天线起初产生的无线电波的电流。
