China has many undeveloped airports, limited air-traffic control capabilities over vast territory and chronic pilot shortages.
中国有很多不完善的机场，空管面积广阔而能力有限，飞行员长期不足。
For the undeveloped regions in China, enterprise clusters in rural territory in Henan province are representative.
河南省农村地域的企业集群在我国欠发达地区具有一定的代表性。
应用推荐