我们使用一个标题、一个描述性的副标题、x和y标签设置了一个图表，将图例放在了底部，并对两个数据集使用标签。
We've set up the chart with a title, a descriptive subtitle, X and Y labels, placed the chart legend at the bottom, and labeled the two data sets.
Series用于设置图表和图例显示的点类型。
The Series sets what point types are displayed for both the chart and legend.
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