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
자연철학은 자연의 원리를 이해하려고 하는 학문입니다.jayeoncheolhak-eun jayeon-ui wonli-reul ihaeharyeogo haneun hakmun-imnida.Natural philosophy is a discipline that seeks to understand the principles of nature.