1.crime It is the business of the police to prevent and detect crime and of the law courts to punish crime.
防止和侦破犯罪是警察的职责，而惩罚犯罪是法庭的责任。
2.It is the business of the police to prevent an detect crime and of the law courts to punish crime.
防止和侦察犯罪是警察的任务，惩罚犯罪是法庭的责任。
3.Police prevent and detect crime while the courts punish the crime.
防止及侦察犯罪是警察的事而惩罚犯罪是法庭的事