接着在当前流行的镜像技术的基础上，描述了双机热备份系统的的基本功能，并分析了NC双机热备份系统的功能和需求。

Then based on the widely used current mirror techniques, we described some basic functions of the dual-hot-standby system, and analyzed the functions and their requirements of it in NC.

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市场上存在的一些双机热备份容错系统由于系统监测容错软件本身存在出错的可能性，使得双机热备份系统的可靠性和安全性受到威胁。

The reliability and safety of some fault tolerant systems on the market are in the danger in fact, because the software monitoring the system may be fail.

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笔者在深入细致地分析、比较了当前常见的双机容错热备份系统的实现方法及其性能优缺点后，提出了一种基于“层”模式的双机热备份系统解决方案。

After analyzing the main modes of the duplicated fault tolerance system currently, the author gives readers new duplicated fault tolerance system based on "layer" mode.

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