名词中文翻译
中文翻译：圆周度
同义词：
['circumference', 'circumference rate', 'circumference ratio']
例句：
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1.The circle's diameter is 20 meters, and its circumference is 31.42 meters.
这个圆的直径是20米，周长是31.42米。
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2. The circumference of the circle is twice as long as the diameter.
圆的周长是直径的两倍长。
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3.The circumference of a circle is always equal to the radius times the circumference of a smaller circle.
圆的周长总是等于半径乘以更小圆的周长。