The low plain became an ext ensive sand sea environment under the actions of the cold and dry winter monsoon , the sand sea environment was called the shelf sand sea and constituted the eas t margin of the North Hemisphere desert belt.是什么意思_The low plain became an ext ensive sand sea environment under the actions of the cold and dry winter monsoon , the sand sea environment was called the shelf sand sea and constituted the eas t margin of the North Hemisphere desert belt.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句