近年来,上海地区的偷渡活动有持证闯关型、假蒙骗型、道跳板型、险越境型、留不归型等五大类型。

• In recent years, the activities of running a blockade in Shanghai district have five types: holding passports to brave the barrier, faking to cheat, going by a roundabout route and detaining instead of returning.