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。
The interval duration of mastication of linear occlusal dentures was shorter than that of anatomic occlusal dentures in the mastication movement cycle( P< 0.05 ).
在咀嚼运动循环中，线性总义齿咀嚼周期的间歇期短于解剖式总义齿（P<0.05）。
The surface body electrocardiogram(ECG) manifestations of biatrial pacing are that P wave duration shortens, the polarity of P wave changes to negative, PR interval gets shorter correspondingly.
双房同步起搏体表心电图表现为P波时限短、负向或正负双向，PR间期相应缩短。
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