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1. Oxford Dictionary

   rarefy

   • IPA[ˈrɛːrɪfʌɪ]

   英式

   • v.
     make or become less dense or solid

   • verb: rarefy, 3rd person present: rarefies, gerund or present participle: rarefying, past tense: rarefied, past participle: rarefied

2. • 釋義
   • 相關詞

   v.

   動詞

   • 1. make or become less dense or solid air rarefies and degrounds the physical body as the shell continues to expand and rarefy, astronomers may eventually be able to see characteristic gamma rays from the radioactivity within

   rarefied

   • adj.
     (of air, especially that at high altitudes) of lower pressure than usual; thin: every ounce carried counts triple when you're trudging uphill in rarefied air

   Oxford Dictionary

   rarefied

   • adj.
     (of air, especially that at high altitudes) of lower pressure than usual; thin: every ounce carried counts triple when you're trudging uphill in rarefied air

   Oxford American Dictionary