quasigeoid

例句：

1. 1. The quasigeoid is a shape that resembles asphere but has a slightly different radius.
   准球状体是一种形状类似于球体但半径略有不同的物体。
2. 2. In the studyof planetary mechanics, the quasigeoid is used to model theshape and behavior of planets.
   在行星力学研究中，准球状体被用来模拟行星的形状和行为。
3. 3. The quasigeoid is an important concept in thestudy of gravity and spacetime.
   准球状体是研究引力和时空的重要概念。