名词
中文翻译：Unknown
同义词：
['subway', 'tunnel', 'shaft', 'tunnel']
例句：
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1.The underground passage is so narrow that it's hard to move through.
这个地下通道太窄了，很难通过。
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2.The tunnel was filled with the sound of dripping water.
隧道里回荡着滴水声。
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3.The shaft is used for mining and transportation.
矿井用于采矿和运输。