P waves P波
Plane P waves 平面P波
plane p-waves 平面p波
p waves recognition p波识别
Accompanying p-waves 伴随纵波
long-period p-waves 长周期p波
p waves and s waves 纵波与横波
Earthquakes begin with tremors called P-waves that have short wavelengths and generally do little damage; they may not even be felt by humans.
地震从称为P -波的震动开始，P -波波长短，一般很少损害；人们甚至感觉不到。
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.
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。
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