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
은본위제는 화폐의 가치를 은으로 정하는 제도입니다.eunbonwijeun hwapyui gachi-reul eun-euro jeonghaneun jedoimnida.The silver standard is a system that determines the value of currency based on silver.