常見例句Newton's theory of gravitation is an approximation of a more general theory.牛頓的引力理論只是一種更普遍理論的近似形式。At that time, the Newtonian theory of gravity and the concept of escape velocity were well known.那時(shí)，牛頓引力理論和逃逸速度的觀念是廣為人知的。 返回 gravitational theory