名词
中文翻译：周长
同义词：
['circumference', 'periphery']
例句：
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1.The park has a perimeter of 5 kilometers.
这个公园的周长是5公里。
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2.The circle's radius is the same as its diameter, so the perimeter is twice as long.
圆的半径与直径相同，所以周长是其长度的两倍。
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3. The teacher asked the students to calculate the perimeter of the square.
老师要求学生们计算这个正方形的周长。