rarefied
(of the oxygen level in the air) containing a lower-than-average amount of oxygen
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稀薄的, 缺氧的
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declining
experiencing a gradual reduction or decrease in quality, quantity, or value over time
![下降的, 减少的](https://api.langeek.co/v1/assets/flags/zh.png)
下降的, 减少的
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[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