Triplasis

例句：

1. 1. The planets are moving in a triangular pattern around the sun.
   行星围绕太阳呈三角形排列。
2. 2.The scientists discovered that the earth's rotation causes a tripolar motion.
   科学家们发现地球的旋转导致一种三体运动。
3. 3.The astrophysicist observed the tripolar motion of the planets during their orbit.
   天文学家观察到行星在轨道上的三体运动。