登山者通常会携带氧气筒，因为在极高的地带空气相当稀薄。
Mountain climbers often carry oxygen tanks because the air is very thin at high altitudes.
空气似乎很稀薄，好像在混合的气体中剩下的氧气很少。
The air seemed thin as though its combination of gases had little oxygen left.
空气似乎很稀薄，好像在混合的气体中剩下的氧气很少。 。
Thee air seemed thin as though its combination of gases had little oxygen left.
空气似乎很稀薄，好象在混合的气体中剩下的氧气很少。
The air seemed thin as though its combination of gases had little oxygen left.
空气似乎很稀薄，好象在混合的气体中剩下的氧气很少。
The air seemed thin as though its combination of gases had little oxygen left.
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