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rarefaction n. 变成稀薄,稀薄化,稀薄 变成稀薄,稀薄化,稀薄 rarefaction n 1: a decrease in the density of something; "a sound wave causes periodic rarefactions in its medium" Rarefaction \Rar`e*fac"tion\ (r[a^]r`[-e]*f[a^]k"sh[u^]n), n.
[Cf. F. rar['e]faction. See {Rarefy}.] The act or process of rarefying; the state of being rarefied; -- opposed to condensation; as, the rarefaction of air. [1913 Webster]
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