Saab将升级其战斗和火力控制系统到9lv Mk 4，即第四代海军指挥和控制系统。
Saab is upgrading the vessels' combat and fire control systems to 9lv Mk4, the fourth generation naval command and control system.
大无线电话公司已经开始构建被称为4G（第四代）网络的下一代手机系统。
The major wireless phone companies have begun building out the next generation of cellular phone systems, called 4G, or fourth- generation , networks.
第四代移动通讯系统的特点是：多种接入网络和基于IP的传输技术。
The fourth generation of the mobile communication systems are characterized by the heterogeneous access networks and IP-based transport technologies.
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