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   丹麦语
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短语
decibel 名词
物理科学 decibel
环境 decibel A unit used to express relative difference on power, usually between acoustic or electric signals, equal to ten times the common logarithm of the ratio of the two level
音乐 decibel (dB)
decibel: 2 短语, 1 学科
运输2