The wavelet packet method characterized by good time-frequency localization can be used to make signal reconstruction and energy analysis of blasting vibration wave.

利用小波分析良好的时频局部化性质，可以很好地对爆破地震波进行信号重构和能量分析。

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As these experiments show, begging apparently provides a signal of need that parents use to make judgments about which offspring can benefit most from a feeding.

正如这些实验所显示的，乞求显然提供了一种需要的信号，父母可以利用这种信号来判断哪些孩子能从喂食中获益最多。

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Wireless devices, however, introduce a number of different factors that make the transmission of this signal a lot more difficult.

而无线设备面临很多不同的因素可以使得信号的传输更加困难。

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But taken together, they can make a difference and they send a signal that we are serious about changing how government operates,"

VOA: standard.2009.04.20

When they receive the signal they make - they change in a very specific way and the cell can recognize this change that's occurred at the cell surface.

当它们接收到信号之后,就会发生十分特殊的变化,细胞能够识别自身表面发生的这种变化

耶鲁公开课 - 生物医学工程探索课程节选

On the other hand, we were able to do that precisely because we wanted to prevent layoffs and we wanted to make sure that we sent a signal that everybody is going to have to make some sacrifices, including federal workers.

WHITEHOUSE: Twitter Town Hall

Inside, Williams explains, is a receiver tailored to make use of a signal from an atomic clock carried by a global positioning system satellite.

FORBES: Magazine Article

By timing how long the signal takes to make the return trip, the instruments can determine differences in height.

BBC: Mapping Earth's surface in 3D