encirclement
noun /ɪnˈsɜːklmənt/
  /ɪnˈsɜːrklmənt/
[uncountable] (formal)- the act of surrounding somebody/something completely in a circle环绕;围绕;包围 - The encirclement of the world by telegraph by the early 1870s represented a revolution in communications. 19世纪70年代早期电报对世界的包围代表了通信领域的一场革命。 
 
- The encirclement of the world by telegraph by the early 1870s represented a revolution in communications.