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。
What is needed is a system that USES low-frequency radio waves.
这需要的是一种利用低频无线电波的系统。
The other problem is that submarines receive messages using low-frequency radio waves that can penetrate water, but only a few characters per second can be transmitted at these frequencies.
另一个问题时潜艇在水下时用低频进行通信，因为低频可以穿透海水传播，但用低频通信时，通信速度只能每秒几个字符。
At ground level, such vibrations-akin to low-frequency sound waves-are very small, only about the size of the vertical motions that produce them.
在地表，这种类似于低频声波的振动非常小，只相当于造成它们的垂直振动的幅度。
As these waves pound against the sea floor, they generate a constant vibration with a frequency of about ten millihertz, much too low for humans to hear but easily detectable with seismometers.
当这些压力波撞击海床时，会产生一种频率为0.01赫兹的连续振动，而对我们人类而言这个频率太低了，所以根本听不到，但却很容易被地震仪侦测到。
It is called delta sleep because of the presence of high amplitude, low frequency delta waves that are seen to occur in the EEG.
这个阶段的脑电图以高幅低频的三角形delta波为主，所以被称为Delta睡眠。
In this paper, the other question we discuss is nonlinear acoustic-optical effect from liquid surface waves at low-frequency.
本文另一部分内容研究了液体表面低频声波的非线性声光效应。
The output waves of traditional resonant DC-Link inverter have too much low frequency harmonic waves which affect the output performance, because it can only use DPM control.
由于传统谐振直流环节逆变器只能采用离散脉冲调制方式，输出波形中含有丰富的低次谐波，严重影响输出性能。
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。
Laser diffraction from liquid surface waves at low-frequency was experimentally realized, a laser diffraction technique for measuring surface tension and surface pressure was designed.
实验上实现了低频液体表面波的激光衍射，提出了激光衍射法测量液体表面张力和表面压。
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。
Of particular interest are waves that simulate low-frequency motions and that help to establish and maintain the equatorial current system.
能模拟出低频运动并有助于建立和维持赤道洋流系统的波动有着特殊的意义。
The eigenmode equation in this dissertation can also be used to study the ETG mode, the drift Alfven waves, and so on. So it provides a unique frame to study the low frequency drift instabilities.
由于完整地包含了离子和电子的动理学行为，本文的模型方程也可以研究ETG模，漂移阿尔芬模等不稳定模态，并且为在同一的框架内研究低频漂移不稳定性提供了平台。
The technique of electromagnetic waves in SLF (Super Low Frequency) frequency band can be investigated in the light of geophysical theory combined with radio-physical theory.
超低频 （SLF）电磁波技术利用地球物理和无线电物理相结合的原理 ，由人工产生大功率电磁波信号。
The technique of electromagnetic waves in SLF (Super Low Frequency) frequency band can be investigated in the light of geophysical theory combined with radio-physical theory.
超低频 （SLF）电磁波技术利用地球物理和无线电物理相结合的原理 ，由人工产生大功率电磁波信号。
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