中国与朝鲜的边界已正式划定了.The border between China and Korea has been formally delimited.梅尔文发现的一份文件帮助他准确地定位了朝鲜的航空信号灯位置.Melvin found one that helped him pinpoint North Korea's aeronautical beacons.中国的消费产品也大量出现在朝鲜的商店和市场上.Chinese...