短语词组短语corn belt maize belt 玉米产区corn belt in jilin 吉林玉米带corn belt climate 玉米带气候Golden Corn Belt 黄金玉米带the corn belt 玉米带;产玉米区jilin corn belt 吉林玉米带Corn and Winter Wheat Belt 玉米冬小麦带 返回 corn belt