Because ventilating requirement of cross-ocean tunnel, expecially long distancecross-ocean tunnel, ventilating shaft should be set at sea.
跨海隧道，特别是长距离跨海隧道，由于隧道内通风的要求，必须在隧道中间即海中设置通风竖井。
参考来源 - 跨海隧道自立式通风竖井整体稳定分析与施工问题探讨·2,447,543篇论文数据，部分数据来源于NoteExpress
整个旅途他们都保持一声不响，甚至到他们穿过跨海隧道进入了英格兰。
They stayed mum throughout their trip, even as they crossed the Channel into England.
渤海海峡跨海通道或大连-烟台隧道工程提出了一个海底隧道的建设，以连接大连的辽东半岛到烟台的山东半岛。
The Bohai Strait tunnel or Dalian-Yantai tunnel project proposes the construction of an underwater tunnel to connect Dalian on the Liaodong Peninsula to Yantai on the Shandong Peninsula.
长距离深海跨海沉管隧道，为满足隧道内运营通风的要求必须在隧道中部设置通风竖井。
Because of ventilating requirement of cross-ocean tunnel, especially long distance cross-ocean tunnel, ventilating shaft should be set in the sea.
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