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
변경식 발전소는 강의 수위를 이용하여 전기를 생산합니다.byeongyeongsik baljeonso-neun gang-ui suwi-reul il-yonghayeo jeon-gi-reul saengsanhamnida.The hydroelectric power plant generates electricity using the river's water level.