Fill determines the color of the fillarea under the line in area line graphs and determines the bar fill color for bar and column graphs.
fill指定区域线形图中的线条下方的填充区域的颜色，以及条形图和柱形图的条填充颜色。
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Goodman hopes the scheme will enable active students to fill in any gaps in their experience and encourage their less-active peers to take up activities outside their academic area of work.