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
수광은 물체의 표면에서 빛이 반사되는 현상입니다.Sugwang-eun mulche-ui pyomyeon-eseo bich-i bansadeuneun hyeonsang-imnida.Light reflection is the phenomenon where light is reflected off the surface of an object.