名词
中文翻译：Unknown
同义词：
['tunnel', 'tunneling', 'passageway']
例句：
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1. The engineers were working on the construction of a new tunnel.
工程师们正在建设一条新的隧道。
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2. The tunnel was so dark that we couldn't see each other clearly.
隧道太暗了，我们看不清彼此。
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3. The tunnel is used for transportation between cities.
这条隧道用于城市之间的交通。