这是因为月球环绕地球的轨道是卵形的或者椭圆形的。
This is because of the Moon's orbit around Earth which is oval or elliptical in shape.
椭圆的另一个名字叫“卵形的”。
我们用“oval”这个词是因为可以用“像卵形的”来描述那些椭圆状的东西。
The word “oval” comes to us because it means “egglike” which describes an oval’s shape.
应用推荐