In figure 1, you will find a column displaying a solid circle, a half-solid circle, and an empty circle for each received message.

在图1中，您将发现其中一列对于接收的每条消息显示实心圆圈、半实心圆圈或空心圆圈。

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The figure starts at the small solid circle and ends at the vertical bar.

动作起始点用一个圆的实心圈表示，结束点用一个垂直线表示。

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The figure starts at the small solid circle and ends at the vertical bar.

动作起始点用一个圆的实心圈表示，结束点用一个垂直线表示。

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