On September 15, 2006, Cassini revealed a new diffuse ring at Saturn, coincident with the orbits of Janus and Epimetheus.是什么意思_On September 15, 2006, Cassini revealed a new diffuse ring at Saturn, coincident with the orbits of Janus and Epimetheus.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句