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1. It simulates the interaction of light rays and objects using principles of geometric optics.
   它利用几何光学的原理模拟光线与物件之间的相互作用。
2. The ray theory of geometric optics was applied to visually investigate the propagation of quasi stationary waves in time mean basic flow and interpret the zonal nonhomogeneity.
   应用几何光学中的射线理论，直观地讨论了准定常波在时间平均基流中的传播，解释了定常波传播的纬向非均匀性。