... 气体混合 combination of gases 槽配合 combination of slots 组合操作，联合运行 combination operation ...
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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。
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。
Thee 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。 。
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