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rarefy

英['reərɪfaɪ] 美['rɛrə,fai]

vt. 使纯化；变稀薄；精选
vi. 变稀薄；纯化

英英释意

1. lessen the density or solidity of;: "The bones are rarefied"

2. make more subtle or refined

3. weaken the consistency of (a chemical substance)