北岳の肩の小屋標高3000ｍで実験してみました酸素は薄いのかさあ どうでしょうon the way to kitadake, i did an experiment to see if oxygen is really thinner, 3000m above sea level ...and it was, as i got tired after a few seconds of jump roping, which doesnt happen at sea level ... 北岳 山 登山 酸素 ...
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