抛物线方程（PE）是波动方程的一种近似形式，它假设电磁波能量在沿着抛物线轴向的锥形区域内传播。
The Parabolic Equation method (PE) is an approximation of the wave equation, which models energy propagating in a cone centred on a preferred direction, the paraxial direction.
能量的传播是弹性波的一个重要特征。
The energy transmission is one of the important characteristics of the elastic wave.
海洋内孤立波是一种携带巨大能量的特殊内波，它能够在海洋中长距离传播而保持波形基本不变。
Internal solitary waves are a kind of special internal waves, which could bring enormous energy and propagate long distance in the ocean with its wave form basically unchanged.
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