英语词汇“block signal”是什么意思，“block signal”的读音、用法及例句翻译-乐坝网

词汇	block signal
释义	block signaln.（名词） A fixed signal at the entrance to a railroad block, indicating whether or not trains may enter.火车行止信号：火车站入口处，指示火车是否可以进站的固定信号
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