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
지렛목을 사용하여 무거운 물체를 쉽게 들어올릴 수 있습니다.jiretmogeul sayonghayeo mugeoun mulcheoreul swibge deureoolil su itsseumnida.You can easily lift a heavy object using a fulcrum.