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
Secondary waves travel more slowly and arrive after the P-waves.
次要波传播的更慢，发生在P波之后。
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。
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。
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