The Pape proved that the gravitation between two homogeneous balls is equivalent to the gravitation between two mass points, when the mass of two balls gathers at the center of the ball.是什么意思_The Pape proved that the gravitation between two homogeneous balls is equivalent to the gravitation between two mass points, when the mass of two balls gathers at the center of the ball.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句