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英语单词“circumference”的意思是圆或环形的周围。其发音为英 [ˌsɜːkəmfəːrəns]，美 [ˌsɜːrkəmfərəns]。例句如下：
1. The circumference of the circle is equal to twice the radius. 圆的周长等于半径的两倍。
2. The circumference of the circle is measured by a radius. 圆的周长由半径测量。
3. The circumference of the earth is approximately 40,074 kilometres. 地球的周长大约是40,074公里。
4. The circumference of the cylinder is 2 metres. 圆柱的周长是2米。
5. The circumference of the square is equal to the sum of its sides. 正方形的周长等于各边之和。
6. The circumference of a given circle can be used to find its radius. 给定圆的周长可以被用来找到它的半径。
7. When the points of intersection are added together, you get the circumference. 将交点的数值相加可以得到圆的周长。
8. He was aware that if you stretched a piece of string along its circumference it would have exactly twice the length required to cover the circle. 他意识到如果沿着圆的周长抻一段线，它刚好是覆盖这个圆所需的线的两倍长度。
9. If you take a circle and add the points at the top and bottom together, you get twice the circumference of the circle. 如果把圆的上底和下底的各点相加，就能得到圆周长的两倍。
10. It was the circumference of the circle that was measured by the radius, not the radius itself. 圆的周长是由半径来测量的，而不是半径本身。
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