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
의사는 청진기를 사용하여 환자의 심장 소리를 들었다.uisaneun cheongjingi-reul sayonghayeo hwanja-ui simjang sorireul deureotda.The doctor used a stethoscope to listen to the patient's heart sounds.