cir
cum
ference
复数形式
circumferences
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周长, 圆周
the distance around the external boundary of something
- The athlete completed a lap around the track, covering the entire circumference in record time.
运动员完成了跑道的一圈，以创纪录的时间覆盖了整个周长。
- To estimate the size of the pond, we measured the circumference using a measuring tape.
为了估算池塘的大小，我们用卷尺测量了周长。
- She measured the circumference of the tree trunk to determine its age.
她测量了树干的周长以确定其年龄。
同义词：
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周长
(geometry) the length of the external boundary of a curved shape, especially a circle
- The formula for finding the circumference of a sphere involves multiplying the diameter by π (pi).
求球体周长的公式涉及将直径乘以π（pi）。
- In geometry class, we learned how to find the circumference of various geometric shapes.
在几何课上，我们学习了如何找到各种几何形状的周长。
- To find the circumference of a wheel, you need to know its radius or diameter.
要找到车轮的周长，你需要知道它的半径或直径。
- The teacher explained that the circumference is different from the area of a circle.
老师解释说周长与圆的面积不同。
- The mathematician used the circumference to solve the geometry problem.
数学家使用周长来解决几何问题。
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