但是，订阅者的初始花费很低，他们能够获得支持服务（通常是24/7服务），而且不用担心软件的服务器、安装、升级以及维护等问题。

However, subscribers benefit from low initial costs, have access to (usually 24/7) support services, and needn’t worry about hosting, installing, upgrading, or maintaining the software.

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采用软件无线电技术的雷达导引头具有结构简单、可靠性高、易于维护升级、抗干扰性能强等优点。

The active seeker with software radio techniques has the merits of simple structure, high reliability, easy upgrade, easy maintenance and good anti-jamming capability.

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同时在目前运行的微机保护装置的软件的编程上采用的传统的流程图线性程序，造成了软件的不易维护，升级换代困难等问题。

And traditional flow chart linearity programme is adopted in most microprocessor-based protection device for the present, which makes some problems such as hard maintenance, hard upgrade and etc.

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