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... on the glacier at a fractionated pace, finally felt a little fatigued.
Although the altitude sickness and thin oxygen had negligible effects on him,
maintaining a high-intensity activity for a long time made him feel slightly oxygen-deprived.
This is because, during intense exercise, the muscles and organs consume oxygen at a very fast pace. Simply relying on the body's reserves and the amount of oxygen absorbed at the moment is not enough to replenish the consumption. < ...
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