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rarefy
英
美/ˈɹɛɹəfaɪ/
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01v.
使稀少, 使稀薄, 使纯化, 精炼
lessen the density or solidity of; make more subtle or refined; weaken the consistency of (a chemical substance)
02v.
变稀少, 变稀薄
lessen the density or solidity of; make more subtle or refined; weaken the consistency of (a chemical substance)