The parabolic wave model is more reliable than the simple refraction model in bigger area with slowly -varying water depth.
对于港外大范围缓变地形水域，抛物型方程模型较传统的折射模型则更可靠。
From the Angle of wave motion optics, on the principle of Huyghens, explaining the light of refraction. Simplifying the picture of the light of refraction and then getting a simple drawing method.
从波动光学的角度，用惠更斯原理解释了光的折射现象，根据惠更斯原理所作的折射光线进行简化，得出较为简单的作图方法。
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