Li Younan and the others had been out from the RV campsite for some time.
There was always an oxygen supply in the RV, so even at an elevation of 4,000 meters, there wasn't any obvious impact.
However, once out of the RV, the surrounding environment truly reflected the oxygen level appropriate for 4,000 meters above sea level.
Liu Li wandered outside for a while, and soon felt dizzy, with a slight throbbing in her temples.
Only then did she realize she was experiencing altitude sickness, because Li Younan had protected her so well that she had almost forgotten she was on the plateau all this time.
She couldn't help but think that without Li Younan's preparations, this journey definitely wouldn't have been so smooth.
Those who drive themselves from coastal areas along National Highway 318 don't have such conditions, and just the altitude sickness along the way can be quite a torment.
