All the plot types except pie can have multiple series.

所有图表类型(除了饼图)都可以拥有多个系列。

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You only have one task, and it is currently on track. If you had multiple tasks waiting for your work, the pie chart at the top left shows you how many of them are on track or delayed.

您只有一个任务，并且它目前进展良好，如果您有多个任务等待处理，左上角的扇形图将显示进展良好或延迟任务的数量。

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They may raise the quality of these presentations and documents by prohibiting bad practices such as pseudo-three-dimensional charts or multiple pie charts.

FORBES: Should I Shade Alternate Rows in My Tables?