translation.en: The Moon is kept in orbit, according to these ideas, because it rolls along a valley in the curved environment that the Sun and the Moon and the Earth can all create by virtue of their presence.
translation.zh: 根据这个想法，月亮之所以能保持在它的轨道上， 是因为它沿着曲面的内测旋转 太阳，地球，月亮间的影响力均是因为它们本身的存在而产生的。