严格说来，所有的模拟时变信号。

Strictly speaking, all signals are analog time-varying signals.

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带宽说明了仪器在某一频率范围内响应时变信号的能力。

Bandwidth describes the instrument's ability to respond to time varying signals over a range of frequencies.

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提出了基于变时基短时傅里叶变换来分析和处理时变信号的技术。

Measuring and analyzing technology based on variable-time-interval Fourier transform was dealt with for vehicle accelerating noise signal.

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So this is not a very positive sign and people are having a bad relationship with food.

这不是个正面的信号,人们和食物之间的关系变糟

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选