Fortunately, you can identify the process of a single message through the system by using the unique reference number that each E-mail is given.

幸运的是，通过使用为每封电子邮件所给定的唯一引用编号，您可以在系统中标识对每个消息的处理过程。

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This paper puts forward a new MRACS method using low order model, i. e. the fourth order hydraulic servo system following the first order reference model.

本文把液压伺服系统作四阶系统，跟随一阶参考模型，提出了一种新的高阶对象和低阶模型的MRACS 的方法。

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The research of middleware technology that is discussed in this paper can be used for reference in developing other similar E-business system.

本文对中间件技术的研究探索值得类似电子商务系统开发分析借鉴。

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