名词
中文翻译：圆弧
同义词：
['circle', 'circumference', 'arc例句：1. The perimeter of the circle is 20 units.（这个圆的周长是20单位。）']
例句：
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1. The perimeter of the circle is 20 units.
这个圆的周长是20单位。
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2.The circumference of the circle is twice as long as its diameter.
这个圆的周长是直径的两倍长。
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3.The arc of a circle is the part of it that lies between two points.
圆弧是圆上两点之间的部分。