求翻译：　(2)次波在P点处所引起的振动的振幅与r成反比。 这相当于表明次波是球面波。 　　(3)从面元dS所发次波在P处的振幅正比于dS的面积,且与倾角θ有关，其中θ为dS的法线N与dS到P点的连线r之间的夹角，即从dS发出的次波到达P点时的振幅随θ的增大而减小(倾斜因数)。是什么意思？

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( 2) Meeting Point premises P wave caused by the vibration amplitude inversely with r. This is equivalent to indicate that the wave is a spherical wave. ( 3) A meeting from a million dS P wave in the area of the amplitude proportional to dS and as with an inclination to be relevant, for which the la

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　(2) the secondaries in p premises cause vibration amplitudes and inversely proportional to r. 　　This which indicates that the S wave is a spherical wave. (3) from the surface element dS the S wave in dS-p amplitude is proportional to the area, and associated with the angle θ, where θ is the normal

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