... 圬工梁裂损 cracking of concrete and masonry beam 隧道漏水 tunnel leak 衬砌裂损 lining cracking ...
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leak tunnel 渗水隧洞
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The accident started with a gas leak that let gas pour into the main tunnel and trigger an explosion due to poor ventilation.
事故由瓦斯泄露引起，在通风不畅的情形下，瓦斯涌入主要通道，引发了爆炸。
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