The catch is that because low-frequency waves can travel great distances, when they do bounce off cavities or objects underground, they often end up far from the detection equipment at the surface.
捕捉过程是这样的，因为低频波可以传输到更远的距离，当它们遇到地下的空穴或其他物体反射回来的时候，已经距地面的接收装置很远了。
The detection of Pre-P wave was affected by the heart rate, respiratory, artefact and low frequency waves.
前波的表达受心率、呼吸、伪差及低频波等因素干扰。
First, in the field of atmospheric dynamics the developments in dynamics of diabatic waves and low frequency waves, the dispersive effects of turbulence and nonlinear atmospheric waves are reviewed.
在大气动力学领域，主要介绍了非绝热波和大气低频动力学、湍流的频散效应和大气非线性波动等方向的研究进展。
First, in the field of atmospheric dynamics the developments in dynamics of diabatic waves and low frequency waves, the dispersive effects of turbulence and nonlinear atmospheric waves are reviewed.
在大气动力学领域，主要介绍了非绝热波和大气低频动力学、湍流的频散效应和大气非线性波动等方向的研究进展。
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