jail. A building used for the confinement of individuals awaiting trial, or who have been convicted of minor offenses. The term PRISON is sometimes used interchangeably with jail, but PRISON is usually the place where only those with long-term sentences are confined.
從這裏可知,jail和prison的功能對等詞不同,jail更接近中國的“看守所、拘留所”,prison的功能對等詞則應該是“監獄”。