“椭圆的”用英语怎么说？

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....