Primary waves are identical in character to sound waves. The ground is forced to move forwards and backwards as it is compressed and decompressed.
主要波跟声波的特征相同，当地面被加压或减压时强迫向前和向后移动。
P-waves are sometimes known as primary waves, because they travel faster through the Earth and so are the first to arrive at monitoring stations.
P波有时被看作纵波，因为它们以更快的传递速度穿越地球内部，因此最先被地震监测站台发现。
Detecting the primary waves from an earthquake is like seeing the flash of lightning before hearing the thunder and getting drenched by the rain.
探测到一次地震的初波就好比要在听到雷声并且被雨淋透之前看到闪电。
P-waves are sometimes known as primary waves, because they travel faster through the Earth and so are the first to arrive at monitoring stations.
波有时被看作纵波，因为它们以更快的传递速度穿越地球内部，因此最先被地震监测站台发现。
The warning system works by detecting primary waves, which spread from the epicenter of a quake and travel faster than the destructive shear waves.
预警系统的工作原理是探测最初从震中传出的地震波，其速度要比破坏性的剪切波快。
Waves and currents, both wave generated and tidal, are the primary agents of erosion on the delta.
受潮汐影响产生的海浪和海流是三角洲腐蚀作用的主要营力。
Results the calculation result shows that spherical surface of the conductor buried in sandy soil presents not only primary and secondary scattered waves but also multiple wave and creeping.
结果表明埋藏在沙土中的导体球面不仅仅存在一次和二次散射波，而且还存在多次波和爬行波。
Acoustic waves are a primary candidate for supplying the energy necessary to heat the solar chromosphere and corona.
声波是供给太阳色球和日冕加热所需能量的主要候选能源。
The other two, Primary (P) or compression waves and Secondary (S) or shear waves, penetrate the interior of the Earth.
另外两种，P或者“压缩波”以及S“剧烈波”，穿透地球内部。
Seismic surveying is largely concerned with the primary P waves.
地震勘探主要研究一次纵波。
The transducer emits ultrasonic waves into the fluid that are not parallel to the primary flow of fluid through the tank.
该换能器发射不平行于穿过该容器的主要流体流的超声波进入流体。
The transducer emits ultrasonic waves into the fluid that are not parallel to the primary flow of fluid through the tank.
该换能器发射不平行于穿过该容器的主要流体流的超声波进入流体。
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