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题目材料：
New underwater tunnel projects increasingly rely upon immersed tube technology, which involves digging a channel in the seabed and then sinking prefabricated tunnel sections into it. As well as being more resilient in earthquakes, immersed tubes are generally faster and less expensive to build than traditional bored tunnels. To begin with, problems with one section of tunnel won`t necessarily delay the entire project, and because immersed tubes can have a rectangular cross-section, they are a more efficient shape than circular tunnels for side-by-side railway lines. And while bored tunnels are usually considered stable only if their depth under the seabed at least equals their diameter, immersed tubes can sit immediately under the seafloor, allowing shallower approach gradients.
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信息题-信息本身及合理推断
信息题-信息本身及合理推断
以上解析由 考满分老师提供。
