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1. Oxford American Dictionary

   rarefied

   • IPA[ˈrerəˌfīd]

   美式

   • adj.
     (of air, especially that at high altitudes) of lower pressure than usual; thin；distant from the lives and concerns of ordinary people
2. • 釋義

   adj.

   形容詞

   • 1. (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
   • 2. distant from the lives and concerns of ordinary people debates about the nature of knowledge can seem very rarefied