abatement
a reduction or lessening in the intensity, degree, or amount of something
减少某事物的强度或数量
[名词]
rarefied
(of the oxygen level in the air) containing a lower-than-average amount of oxygen
稀薄的
[形容词]
declining
experiencing a gradual reduction or decrease in quality, quantity, or value over time
下降
[形容词]
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