overcrowding       
noun [ U ] uk/ˌəʊ.vəˈkraʊ.dɪŋ/ us/ˌoʊ.vɚˈkraʊ.dɪŋ/
 拥堵|超员|人数过多
a situation when a place contains too many people or things
  Investment in the railway network would reduce overcrowding on the roads. 在铁路上的投资可以减轻道路拥堵的问题。 
 They are building new classrooms to ease overcrowding. 他们正在建新教室以缓解学生人数超员。 
 See: overcrowded
 - More examples
 - Passengers will not accept overcrowding and delays.
 - Overcrowding, violence, and abuse are all part of the shocking state of juvenile justice systems.
 - The project promises to relieve overcrowding in schools.
 - We are trying to build our way out of overcrowding.