The classical elementary waves in Riemann solutions include rarefaction wave, shock wave and contact discontinuity.
黎曼解涉及的经典基本波包括疏散波、激波和接触间断。
The Fetch Area Method (FAM) that derived from elementary waves theory was identified reasonable wave prediction during general winter monsoon season.
经验证明根据元素波模式推衍所得的面积风域法推算波浪，适合于推导季风期间海况的一种方法。
Further on are images of happier times: boats, trees and an elaborate drawing of an elementary school before the earthquake destroyed it. At the top of the building two small figures stand and wave.
还有一些描述了快乐时光的绘画：船、树，一幅精心绘制的图画——地震前的一所小学校，楼顶上站着两个小孩，在挥手致意。
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