P-wave displacement is a polar vector, and its direction remains unchanged when we move it from right hand coordinate system to left hand coordinate system(or in the opposite way).
纵波位移是极向量，在坐标系由右手坐标系变成左手坐标系（或相反）时，不改变位移方向；
Note that the coordinate system starts in the upper left hand corner.
请注意，坐标系统从左上角开始。
Note that the coordinate system starts in the upper left hand corner.
请注意，坐标系统从左上角开始。
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