Seismic surveying is largely concerned with the primary P waves.

地震勘探主要研究一次纵波。

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And researches found that P waves traveled through both liquids and solids while s waves traveled only through solid matter.

研究发现P波能在液体和固体中传播，然而S波只能在固体介质中传播。

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It is shown that so long as the restrained gas exists, there are two P waves and one S wave, even though the fluid phase is incompressible.

结果表明，甚至当液相为不可压缩时，由于束缚空气的存在，饱水土体中亦存在着两种P波。

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Japan's Meteorological Agency is currently testing a prototype system which detects the oh-so-subtle "P Waves" that precede the destructive "S Waves, " and alerts major operations to halt their hustle and take cover.

ENGADGET: Japan Meteorological Agency develops earthquake warning system

They discovered that by shifting the "phase" of light so that the peaks of one wave line up with the valleys of an adjacent one, the two cancel each other, creating "shadows" between waves that are smaller than the waves themselves(see diagram, p. 141).

FORBES: Trick Of The Light