在图1的左侧，我们看到的是浏览器。
Starting from the left side of Figure 1, we see the browser.
注意，图1左侧的工作负载进程指向右侧。
Note that the workload progresses from the left side of Figure 1 toward the right.
消息实现用例步骤的逻辑，图的左侧概括了这些步骤。
Messages fulfill the logic of the steps of the use case, summarized down the left-hand side of the diagram.
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