名词
中文翻译：九点圈
同义词：
['九点圆，九点环例句：1. The nine-point circle is the center of the map.（九点圆是地图的中心。）']
例句：
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1. The nine-point circle is the center of the map.
九点圆是地图的中心。
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2.The nine-point circle is used to measure distances.
九点圆用于测量距离。
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3.The nine-point circle is a common shape in mathematics.
九点圆是数学中常见的形状。