在这个层次的分析上，我们把系统与它的参与者之间的交互描述为一系列消息。
At this level of analysis we describe the interaction between our system and its actors as a series of messages.
数据分析工具可以用以部署到分布系统上，并由不同层次责任的地理分布团队访问和使用。
The data analysis tools can be deployed on distributed systems, and accessed and used by geographically distributed teams with differing levels of responsibility.
在这个层次上出现的大多数“参与者”都将至少由一个属性标识；否则它们就是系统在分析阶段时所不感兴趣的参与者。
Most of the "actors" that appear at this level will be identified by at least one attribute; otherwise they are not interesting to the system in the analysis phase.
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