Hellow guys, Welcome to my website, and you are watching 곡선을 따라 하강하는 입자의 궤적 Particle sliding down along the curve.. and this vIdeo is uploaded by 공부하는박사곰 at 2021-11-20T20:39:26-08:00. We are pramote this video only for entertainment and educational perpose only. So, I hop you like our website.
