名词
中文翻译：隧道
同义词：
['arch tunnel', 'arch tunneling例句：1. The arc tunnel is a crucial part of the construction project.（拱形隧道是该项目建设的关键部分。）']
例句：
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1. The arc tunnel is a crucial part of the construction project.
拱形隧道是该项目建设的关键部分。
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2.The arc tunnel was completed ahead of schedule.
拱形隧道提前完成。
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3.The arc tunnel provides a safe and efficient way to travel through the mountainous terrain.
拱形隧道为穿越山区提供了安全且高效的途径。