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单词 θ76803
释义
the world > matter > physics > science of sound > [noun] > unit of sound absorption (2)
open window unit1900

= sabin, n.

sabin1934

A unit of sound absorption equal to the absorbing power of one square foot of perfectly absorbing surface; = open window unit n. at open, adj.

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更新时间:2024/12/24 1:58:48