飞行员需要适应高空稀薄的空气。
Pilots must adjust to the ___rarefied air at high altitudes.
她的演讲充满了崇高的理想和深刻的见解。
Her speech was filled with ___rarefied ideals and profound insights.
飞行员需要适应稀薄的空气才能在高海拔地区飞行。
Pilots must adjust to the ___rarefied air when flying at high altitudes.
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