矿业工程专业词汇英语翻译(T2) ... tunnel opening 平硐口 tunnel portal 隧道口 tunnel shield 隧道掩护支架 ...
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One unexplained question was why the cells where prisoners were supposed to sleep were left open so that they could make their way to the cell with the tunnel.
整件事情有一个疑点无法解决，就是为什么犯人睡觉的囚室没有上锁，这让他们能够潜入挖有地道的囚室。
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