in the north-east of China 在中国内部东北,如黑龙江省
on the north-east of China在中国东北边上,与中国接壤,如朝鲜半岛
to the north-east of China 与中国东北相邻,不接壤,如日本in the north-east of China和in the north of china的区别in the north-east of China指的是中国东北，如黑龙江in the north of china指的是中国北方，如内蒙古