According to the principle of light propagating linearly,we have formed an invisible warning network for the roadblocks on the railway with several IR beams.
英
美
释义
根据光线直线传播原理,用若干红外光束在铁道路面构成无形路障警戒网,一旦路面出现危险路障遮断光束,即发出险情警报。
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