In May, Qingganchuan self-driving 6/ More than 4000, the last car stopped at the peak of the big winter tree mountain pass. Hey! The four characters of "4120" stand on the top of the mountain. Although it is Mayday, the cold wind on the mountain is close to zero, the oxygen is only 60% of the plain, the pressure is 40% lower than the plain, the ultraviolet intensity is twice as high as the plain, and it takes a few steps to panic and pant. But looking at the alpine grasslands on all sides, the snow-capped peaks in the distance, the blossoming white clouds on the blue sky, all look so fresh and pleasing; the colorful and beautiful prayer flags and stupas are so holy. People left witnesses in front of the 4120's elevation mark. (The next live broadcast notice