switching center

Call center system relates to switching, computer, CTI ( Computer Telephony Integration), database warehouse technology and management science, and nowadays becomes a vital mode for all businesses to serve their customers.

呼叫中心系统涉及了交换技术、计算机技术、计算机电话集成技术、数据仓库技术和管理科学等诸多方面，目前已逐步发展成各行各业为客户提供服务的重要方式。

Store-and-forward message switching center

存储转发信息交换中心

Each base station is associated with a mobile switching center ( MSC) that connects calls to and from the base to mobiles in other cells and the public switched telephone network.

每个基站都要跟“挪动交换核心”接洽，而MSC的作用是交往于基站的号召跟其余蜂窝的挪动用户、公共交换电话网连接起来。

In communications, a manual switching system where incoming messages to the switching center perforate paper tape.

在通信技术中, 一种人工信息[报文]交换方法,即进入交换中心的(信息)报文用手工在纸带上穿孔.

So, switching the area, moving the area to the other side, I'll get double integral of xdA is the area of origin times the x coordinate of the center of mass.

那么，改变一下区域，把这块移到另一侧，我们得到对xdA的双重积分，是原点那的圆面积乘质心的x的坐标。