最常见的症状是缺氧而造成的疲乏。

The most common symptom is feeling tired because the body is not receiving enough oxygen.

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在这样的高度，登山者会因缺氧而晕倒。

At this height, a climber can peg out from lack of oxygen.

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即便环境受到保护，也不能保证不发生因缺氧而发生死亡的情况。

Even if the protective environment is no insurance against death from lack of oxygen.

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即便环境受到保护，也不能保证不发生因缺氧而发生死亡的情况。

Even if the protective environment is no insurance against death from lack of oxygen.

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