And gravity acts alongside several apparent forces to determine what those orbits look like.

重力与几种表观力一起作用，确定了这些轨道形状。

Plus, someone standing at the equator feels an apparent force pushing them away from the center of the Earth, just like one of those spinning carnival rides.

另外，站在赤道上的人会明显感觉到一个往上的推力，就像那种会旋转的游乐设施。