In forests, visual signals can be seen only at short distances, where they are not obstructed by trees.

在森林中，视觉信号只能在没有树木遮挡的地方在短距离内被看到。

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They began to provide a form of air traffic control based on visual signals.

他们开始提供一套以目视信号为基础的空中交通管制。

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By analyzing a digital receiver, the DVI circuit is discussed in detail for the process of the digital visual signals.

通过对一个数字接收器分析，具体讨论了DVI电路对数字视频信号的处理过程。

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Mr Kindel says that the 'smart tiles' design interface of the Windows phones were based on traffic signs and other iconic visual signals you see in everyday life.

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"The system would require placing invasive electrodes in participants and the visual and tactile brain signals involved are quite crude, " Prof James noted.

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They suggest these signals may affect how visual processes work.

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