这个公式用于计算圆的面积。This formula is used to calculate the area of a circle.地球是圆的是常识.It is common knowledge that the earth is round.圆的直径与圆周有相互关系.The diameter and the circumference of a circle correlate....

月球绕地球运行的轨道不是浑圆的, 而是椭圆的.The moon doesn't describe a circle round the earth, but rather an ellipse.本文介绍了一种鲜为人知的用直径距离描绘椭圆的方法.This paper introduces a rarely seen method of describing with diametral distance.叶子的形状;椭圆的形状....

“圆的”的英语可以翻译为：orbicular，rotund，[医] teres，round，circinal ...

“椭圆的”的英语可以翻译为：elliptical ...