It has an axis of symmetry running up and down.

它有一个自上而下的对称轴。

Different shapes in Flatland have different numbers of axis of symmetry.

平面世界中不同的形状有不同数量的对称轴。

A circle actually has infinite axis of symmetry, except poor Mr. Parallelogram, no access for you.

圆实际上有无限的对称轴，除了可怜的平行四边形先生，你无路可走。

If you put heavy stuff close to the axis of symmetry, or close to the wheel axis, then it's stable, too.

“如果你把重物放在箱子对称轴或轮轴附近，那行李箱也会稳定。”

Then, in 1971, I proved that any stationary rotating black hole would indeed have such an axis of symmetry.

然后，在 1971 年，我证明了任何静止的旋转黑洞确实具有这样的对称轴。

They generally only have one axis of symmetry, and by rotating an oval along this axis, the surface of revolution we create is called an " ovoid" .

它们通常只有一个对称轴，并通过沿该轴旋转椭圆形，我们创建的旋转表面被称为卵形。