名词
中文翻译：煤洞
同义词：
['coalpit', 'coal cave', 'coal cellar']
例句：
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1.The miners had to work in the dark and dangerous coalholes.
矿工们不得不在黑暗和危险的煤洞里工作。
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2. The coalhole was filled with a thick layer of sludge.
煤洞里堆满了厚厚的一层污泥。
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3.The coalhole was so deep that it took several hours to reach the bottom.
这个煤洞非常深，需要几个小时才能到达底部。