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]
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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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to gradually reduce or decrease something by cutting away or eliminating bit by bit
逐步减少, 慢慢削减
[动词]
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