名词
中文翻译：循环的
同义词：
['circumferential', 'roundabout', 'round-trip']
例句：
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1.The car circled the block twice before stopping.
汽车在街区内转了两圈才停下。
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2. The train is scheduled to make a circular trip around the city.
火车计划绕城一圈。
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3. The circumference of the circle is 2πr.
圆的周长是2πr。