constituency             
noun [ C ] uk/kənˈstɪtʃ.u.ən.si/ us/kənˈstɪtʃ.u.ən.si/
 选区
one of the official areas of a country that elects someone to represent it in a parliament or legislature
  a rural/urban constituency 乡村/城市选区 
  [ + sing/pl verb ]选区的选民 
the people who live and can vote in a particular area
  He angered his constituency by voting against the bill. 他投票反对议案,激怒了他的选区选民。 
  [ + sing/pl verb ](统称)支持者 
a group of people who support, or are likely to support, a particular person, product, suggestion, etc. 
  There is a large constituency in favour of income-tax reductions. 支持降低收入税的人数量众多。 
 - More examples
 - UK The constituency fell to Labour at the last election, after ten years of Conservative rule.
 - The marginal Tory constituency was held by 2200 votes in 1992.
 - She is popular in her constituency.