special constable
noun [ C ] (also Special Constable) uk/ˌspeʃ.əl ˈkʌn.stə.bəl/ us/ˌspeʃ.əl ˈkɑːn.stə.bəl/ (also informal special, Special)
（英国的）临时警察
in the UK, a person who is not a paid member of the police force but who wears a police uniform and is trained to act as a police officer in certain situations
Why not volunteer as a special constable and support the work of your police force in the community? 为什么不自愿成为一名临时警察，支持警方在社区的工作？
There are nearly 20,000 Specials serving with police forces across the UK. 有近20,000名临时警察供职于英国各地的警察队伍。