overspill
/ˈəuvəspɪl; `ovɚˌspɪl/ n[U]
(esp Brit) people from the overcrowded parts of a city, etc who are provided with housing, usu of a better standard, in the surrounding areas 迁出市区的过剩人口（通常为他们提供附近较好的住房）
build new houses for London's overspill 为伦敦市过剩人口建新居
[attrib 作定语]
an overspill housing development 城市过剩人口住房开发.