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
동태기록기를 사용하여 심장 박동을 측정했습니다.dongtaegirokgi-reul sayonghayeo simjang bakdong-eul cheugjeonghaessseubnida.I used the electrokymograph to measure the heartbeats.