n.圆周，圆周长

原形：circumference复数：circumferences

The earth's circumference is more than 40000 kilometers.
地球的周长为四万多公里。
Pi is the ratio of a circle's circumference to its diameter.
圆周率是圆的周长与直径之比。
This tree has a circumference of 6 feet.
这棵树周长六英尺。
The circumference of the Earth is approximately 40,075 kilometers.
地球的周长大约是40,075公里。
A circle's circumference can be calculated using the formula C = 2πr, where r is the radius.
用公式C=2πr计算圆的周长，其中r为半径。
The tire has a circumference of 2 meters for smooth rolling.
轮胎的周长为2米以保证顺畅滚动。
The race track's circumference was measured to be exactly one mile.
跑道的周长被精确测量为一英里。
The ancient Greek mathematician Archimedes discovered that the circumference of a circle is about three times its diameter.
古希腊数学家阿基米德发现圆的周长大约为直径的三倍。
When designing a watch, the circumference of the bezel is crucial for comfortable wear.
在设计手表时，表圈的周长对佩戴舒适度至关重要。
The Ferris wheel's circumference allowed riders to enjoy panoramic views of the city.
摩天轮的周长让乘客可以欣赏城市的全景。
In geometry, the ratio of a circle's circumference to its diameter is always π (pi).
在几何学中，圆的周长与直径的比例始终是π（派）。
The Olympic swimming pool's circumference is 50 meters, ensuring a standard distance for races.
奥运会游泳池的周长为50米，确保了比赛的标准距离。
To fit the entire map on a poster, we had to reduce the original circumference by 20%.
为了将整个地图放在海报上，我们不得不将原始周长减少了20%。