1. attention is concentrated on 
   本文主要研究
2. milk concentrated by evaporation. 
   通过蒸发使水分消失的牛奶。
3. thick concentrated tomato puree. 
   稠的、浓缩的番茄浓汤。
4. net income concentrated by state 
   国家集中的纯收入
5. their concentrated efforts; his concentrated attention; concentrated study; a narrow thread of concentrated ore. 
   他们集中的努力；他集中了的注意力；集中研究；浓缩矿的狭窄纹路。

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