Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
라디오 방송은 반송파를 사용하여 신호를 전송합니다.Radio bangsong-eun bansongpareul sayonghayeo sinhoreul jeonsonghamnida.Radio broadcasts use a carrier wave to transmit signals.