名词
中文翻译：Unknown
同义词：
['1. stratum', 'horizon', 'bed', 'layer', 'zone', 'seam']
例句：
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1. The mine is located inthe southern part of the country, witha rich mineral resource.
这个矿山位于该国南部，拥有丰富的矿产资源。
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2. The miningcompany has been operating forover 30 years andhas made significant contributions to the localeconomy.
这家矿业公司已经运营了30多年，对当地经济做出了重大贡献。
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3.The miners are working hard to extractmore valuable minerals from the deep underground.
矿工们正在努力从地下深处提取更多的有价值矿物。