[C/U] the distance measured around the edge of a circle or a round object or area 圆周;周长 a circle with a circumference of 2cm 周长为2厘米的圆
The island is 50 miles in circumference. 该岛周长为50英里。
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a.
[C] [usually singular] the edge of a circle or a round object or area 周边 The lamps threw deep shadows beyond the circumference of the pit. 灯光在这个坑的周边之外投下很深的影子。
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