名词
中文翻译：坑道信号
同义词：
['pit signal', 'pit signalling例句：1. The mine was equipped with a pit signal system to ensure safety.（矿井配备了一个坑道信号系统，以确保安全。）2. The engineer used the pit signal to communicate with the miners.（工程师使用坑道信号与矿工沟通。）']
例句：
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1. The mine was equipped with a pit signal system to ensure safety.
矿井配备了一个坑道信号系统，以确保安全。
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2. The engineer used the pit signal to communicate with the miners.
工程师使用坑道信号与矿工沟通。
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3. The pit signal was activated when the tunnel collapsed.
隧道坍塌时激活了坑道信号。