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vt. ʹ��������ϡ������ѡ
vi. ��ϡ��������

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v. attenuate��sublimate��subtilize

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1. Everyone ought to rarefy his spiritual life.
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2. The air rarefies at the top of the mountain.
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v.
  1. lessen the density or solidity of
  2. make more subtle or refined
  3. weaken the consistency of (a chemical substance)

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rarefy
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