1、The air at high altitudes is very rarefied, making it difficult to breathe.
在高海拔地区的空气非常稀薄,呼吸困难。
2、He prefers to engage in rarefied intellectual discussions rather than mundane small talk.
他更喜欢进行高雅的智力讨论,而不是平凡的闲聊。
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