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
아르키메데스의 원리는 물리학에서 매우 중요하다.A-reu-ki-me-de-seu-ui won-li-neun mul-ri-hak-e-seo maeu jung-yo-ha-da.The Archimedean principle is very important in physics.