1. These duties include crime prevention, crowd control, traffic control, operational duties, communication and community relation. 
   现时，他们的职务包括防止罪案、人群管理、交通管制、行动职务、通讯及警民关系。
2. The consistent theme for these techniques is that communication between endsystems on separate subnets initially flows through the routers, with subsequent traffic "shortcut" to the faster switched path. 
   这些技术的一致想法是，不同子网上端站之间的通信先通过路由器，尔后的流量“抄捷径”到更快的交换通道上。
3. Some 20 major items of air traffic control (ATC) equipment and air navigation facilities including radar sensors, radar data processing and flight data processing systems, navigational aids and communication systems were installed. 
   20多项主要航空交通管制及导航仪器设施先后完成安装，包括雷达接收装置、雷达资料及飞行资料处理系统、导航仪器及通讯系统等。
4. carrier telephone communication equipment 
   载波电话通信设备
5. code division multiplex communication 
   码分多路通信

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• 1. 通信量
  communication theory || 通信理论...communication traffic || 通信量...communication transmitter || 通信发射机
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