名词
中文翻译：隧道
同义词：
['underground tunnel', 'mega-tunnel']
例句：
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1. The tunnel is a popular destination for hikers and cyclists.
这条隧道是徒步者和骑自行车者的热门目的地。
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2. The construction of the tunnel has been delayed due to unforeseen technical issues.
由于未预见到的技术问题，隧道的建设已被推迟。
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3. The tunnel is designed to provide easy access to the city center.
这条隧道旨在为城市中心提供便捷的通行方式。