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signal background plate /ˈsɪɡnəl ˈbakɡɹaʊnd ˈpleɪt/ n

中文：信号背景板

中文 · 信号背景板Español · fondo de la señalFrançais · écran de visibilité
Meaning：Plate that frames the signal lights to enhance their visibility.
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Found in these illustrated scenes（1）

Highway-railroad crossing

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