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.
指出把卵形螺旋线扫描系统叫做椭圆扫描系统是不正确的。
It is pointed out that, it is incorrect to speak of the ovoid spiral scanning system as an elliptical scanning system.
指出把卵形螺旋线扫描系统叫做椭圆扫描系统是不正确的。
It is pointed out that, it is incorrect to speak of the ovoid spiral scanning system as an elliptical scanning system.
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