For ship mounted sonar, the transducer received not only the required signal but also the ship noise. for distant signal, the ship noise is a strong interference.

在船用声呐环境中，基阵所接收的除了可能有的目标信号外，还存在本舰噪声，它对于远方的目标信号是一个强大的干扰源。

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If they're right about what ET would do, so many people listening to so rich a region of the sky might even pick up the telltale signal of intelligent life on a distant world within a few years.

也包括电视卫星接受器。如果他们了解外星人要做什么，很多人听到天空中一个区域里不同的声音，在数年之内，甚至有可能接收到遥远的世界里外星生物的信号。

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This paper discusses the key technologies for the design of signal collection circuit in distant electrocardiogram monitoring system, and presents an idiographic actualizing scheme.

讨论了远程心电监护系统中的信号采集电路设计的关键技术。提出了特色鲜明的具体实现方案。

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That breakout above the downtrend line is a distant early warning signal that the psychology of the markets is changing.

FORBES: The Dollar Peeks Above Its 13-Month Downtrend Line

Still his father said nothing, his eyes fixed on the view like a soldier on guard duty, determined not to miss the signal flare sent up by a savage tribe on a distant hill.

NEWYORKER: Town of Cats

Had it been situated in a much more distant galaxy -- as many gamma-ray bursts are -- its signal would have been relatively feeble.

CNN: Why gamma-ray burst shocked scientists