a river of central Africa rising in southeast Central African Republic and flowing about805 km(500 mi) generally west along the boundary with Zaire to merge with the Uele and form the Ubangi River是什么意思_a river of central Africa rising in southeast Central African Republic and flowing about805 km(500 mi) generally west along the boundary with Zaire to merge with the Uele and form the Ubangi River在线翻译_英语_读音_用法_例句