名词
中文翻译：在地下隧道同义词
同义词：
['underground tunnel', 'underground passage']
例句：
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1. The engineers were working on the construction of a tunnel in the earth.
工程师们正在建设一个地下隧道。
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2. The tunnel was so deep that it was difficult to see the bottom.
隧道太深了，难以看到底部。
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3. The tunnel is essential for transportation and communication between cities.
隧道对于城市之间的交通和通信至关重要。