A river rising in the Sayan Mountains of south-central Siberian U.S.S.R. and flowing about965 km(600 mi) generally north to the Angara River.是什么意思_A river rising in the Sayan Mountains of south-central Siberian U.S.S.R. and flowing about965 km(600 mi) generally north to the Angara River.在线翻译_英语_读音_用法_例句