4.High Altitude 高海拔:

      Most people lose consciousness at 15,000 feet. Highland dwellers are fine, because they have more oxygen carrying red blood cells and bigger lungs.

      高度15000尺时大多数人失去意识。高地居民都很好，因为他们身体内部有更多携带氧的红细胞及强壮的肺部。
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