由于 P 波和 S 波以不同但相当恒定的速度传播，它们到达的间隔与到震源或初始破裂点的距离成比例地增加。
Because P and S waves travel at different but fairly constant speeds, the interval between their arrivals increases in proportion to the distance from the earthquake focus, or initial rupture point.
这是一个振幅恒定的波，在共轭的象平面上也是如此。
This is a constant - amplitude wave which is essentially the same on the conjugate image plane.
结果表明绕丁坝的近场流动具有强三维非恒定特性，表现在坝后振荡回流区的形成和坝顶表面波的生成。
The observed information shows that the flow is three dimensional and unsteady due to the fluctuating circulation zone and surface wave.
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