The 200 years successional history of agri ecological system in black soil region almost covered all the successional process happened over the past 3000 years in Central Plain region of China.是什么意思_The 200 years successional history of agri ecological system in black soil region almost covered all the successional process happened over the past 3000 years in Central Plain region of China.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句