单语范例（未经PONS编辑处理）
英语
- Every distance-hereditary graph can be represented as the intersection graph of chords on a circle, forming a circle graph.en.wikipedia.org
- String graphs, the intersection graphs of curves in the plane, include circle graphs as a special case.en.wikipedia.org
- Beginning in the 1750s, he published a series of charts that represent the first instances of line graphs, bar charts, pie charts and circle graphs.www.gizmodo.com.au
- They are a superclass of the trapezoid graph class, and also contain circle graphs and circular-arc graphs.en.wikipedia.org
- However, this also occasionally changes to include a more complex line graph, a circle graph, and on one occasion to-date, a graphic unrepresentative of an actual graph altogether.en.wikipedia.org
- Several authors have investigated problems of coloring restricted subclasses of circle graphs with few colors.en.wikipedia.org
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英语