By means of peasant household sample investigation method, the paper summarizes and analyses the situation and effect of Grain for Green Program in 5 counties of Zhangjiakou Chengde two cities of Hebei.是什么意思_By means of peasant household sample investigation method, the paper summarizes and analyses the situation and effect of Grain for Green Program in 5 counties of Zhangjiakou Chengde two cities of Hebei.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句