In fact, I have always wanted to go to Yan'an to see, and then I decided to go to Xi'an once. The distance is far away, backward, and it is true. Even if the transportation city is so developed, I still feel that some are backward and not easy to reach. I can imagine the state of the year. It's just that the repair is so good, there is no appearance at that time. Don't come if there is no red plot, it's not easy to go thousands of miles