Mount Zheduo, the first mountain above 4000 meters on the way, where I felt the fragility of my life for the first time.

I found a burger stand around 4000 meters altitude at noon. 20 yuan (≈$2.80) for one burger, not expensive. The vendor said he came from Chengdu and only do business here during summer vacation. From another perspective, you can imagine the popularity of tourism along the G318 National Highway this year.

When I was eating the burger, a cyclist with missing right arm came to the stand. However, he seemed completely unconcerned about his disability. When I asked him how could he ride bike with an arm missing, he reacted calmly: "Don't you put your arm on the handbar when you are tired? I just rode here like that." He was truly a man worth respect.

I was already quite uncomfortable at altitude 4000. My two legs are completely powerless and I had to walk and push my bicycle along. Sometimes I had to breath some oxygen from the oxygen tank. According to calculation, the oxygen content here is only 56% of that of the sea level.

I heard from others that the better your fitness, the worse you will feel at high altitude, since better fitness increases your oxygen consumption. I didn't care much about the saying before climbing this mountain. Only when I reached this hight do I feel the lack of oxygen so strongly.

Even the world's best racecar cannot run with gasoline containing half of water.

On top of the moutain, I had an argument with my parents. When I got angered, I immediately lost all my strength and lied down. I spent half an hour to fully recover.

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