名词
中文翻译：Unknown
同义词：
['circumference', 'circumference', 'circumference']
例句：
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1. The formula for calculating the circumference of a circle is 2 * pi * r.
计算圆的周长的公式是2*π*r。
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2. The circumference of the Earth's orbit around the sun is approximately 36,000 kilometers.
地球围绕太阳的轨道周长约36,000公里。
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3.The circumference of the Earth's rotation is about 24 hours.
地球自转的周长大约为24小时。