The privately owned Ambassador Bridge and the public road and rail tunnels that link the two cities are old and narrow.

连接两城的私有大使桥、公路、铁路隧道也已狭窄老化。

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Around the same time, deep and lengthy tunneling of road and rail tunnels was conducted in order to coordinate with mining activities, resulting in reports of similar rock bursts.

深深大概在同时，和长挖洞路和铁路隧道被举办为了协调与采矿活动，造成相似的岩石报告破裂。

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