rarefied
(of the oxygen level in the air) containing a lower-than-average amount of oxygen

稀薄的, 缺氧的

[形容词]
declining
experiencing a gradual reduction or decrease in quality, quantity, or value over time

下降的, 减少的

[形容词]

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(of the oxygen level in the air) containing a lower-than-average amount of oxygen
稀薄的, 缺氧的
experiencing a gradual reduction or decrease in quality, quantity, or value over time
下降的, 减少的