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Rarefying

资料来源 : Webster's Revised Unabridged Dictionary (1913)

Rarefy \Rar"e*fy\, v. t. [imp. & p. p. {Rarefied}; p. pr. & vb.
   n. {Rarefying}.] [F. rar['e]fier; L. rarus rare + -ficare (in
   comp.) to make; cf. L. rarefacere. See {-fy}.]
   To make rare, thin, porous, or less dense; to expand or
   enlarge without adding any new portion of matter to; --
   opposed to condense.
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