Circumference
01
周长, 圆周
the distance around the external boundary of something
例子
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。
02
周长
(geometry) the length of the external boundary of a curved shape, especially a circle
例子
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。
03
周长, 周边
the boundary line encompassing an area or object
