The Russian plain is bordered on the south by the Caucasian mountain range. The Rivers Ob and Yenisei flow into the Arctic Ocean from the Altai and Sayan Mountains.是什么意思_The Russian plain is bordered on the south by the Caucasian mountain range. The Rivers Ob and Yenisei flow into the Arctic Ocean from the Altai and Sayan Mountains.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句