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open prison open one's mind to

open prison
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n.

  • 柯林斯高阶英汉双解学习词典

1. N-COUNT （对犯人限制较少的）不设防监狱，开放式监狱 An open prison is a prison where there are fewer restrictions on prisoners than in a normal prison. 
in AM, use 美国英语用 minimum security prison