Its been two years since the Jade Dragon Snow Mountain Tour, but its still fresh in my memory, because this is the highest altitude Ive been to so far. At that time, I was afraid to die on the plateau for the first time. I bought a bottle in the ancient city of Lijiang. The oversized oxygen cylinder, at the end of the cable car, was still breathing normally. It was decided to board the 4680 again. No oxygen was taken in the whole process. The oxygen bottle was not wasted.