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
COVID-19의 치사율은 시간이 지남에 따라 변할 수 있습니다.COVID-19-ui chisa-yul-eun sigani jinam-e ttala byeonhal su issseubnida.The fatality rate of COVID-19 can change over time.