A cellphone is a miniaturized radio receiver and transmitter, and the health concerns focus on the radio waves it gives off. 手機電話(huà)是袖珍的無(wú)線(xiàn)電接收器和傳送器而且人們對健康的關(guān)注集中在它所釋放的無(wú)線(xiàn)電波。
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. 因收到無(wú)線(xiàn)電波而引起的這些電流等于在傳送器的天線(xiàn)起初產(chǎn)生的無(wú)線(xiàn)電波的電流。
