proliferation       
noun [ U ]  formal uk/prəˌlɪf.ərˈeɪ.ʃən/ us/prəˌlɪf.əˈreɪ.ʃən/
 激增
the fact of something increasing a lot and suddenly in number or amount
  The past two years have seen the proliferation of TV channels. 过去的两年见证了电视频道(数量的)激增。 
 nuclear weapons proliferation 核武(器)扩散 
 See: proliferate
 - More examples
- The proliferation of wireless and broadband services is continuing.
- The Internet encouraged the proliferation of Web-only retail companies.
- The proliferation of social media platforms has meant people can be constantly in touch in a variety of ways.