使用系统数据引导数据库。
人与数据库交互：他们引导数据流的走向；他们解释并处理数据请求。
People interact with databases: they direct data flows; they interpret and service data requests.
其有形的业务很容易描汇出来：诸如通过网络来引导数据流向的路由器和交换机等硬件设备。
Its physical incarnation was easy to picture: hardware such as routers and switches, which direct traffic through a network.
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