名词
中文翻译：圆周
同义词：
['circle', 'circumference']
例句：
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1. Thecircle of light around the sun is calledthe solar system.
围绕太阳的光圈被称为太阳系。
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2. The circumferenceof the earth's orbit around thesun is about 36,000 kilometers.
地球围绕太阳的轨道周长大约为36,000公里。
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3. The circumference of the Earth's equator is approximately 40,075 kilometers.
地球赤道的周长大约为40,075公里。