名词
中文翻译：铁锰结核
同义词：
['iron manganese nodule', 'iron manganese concretion']
例句：
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1. The iron manganese concretions are a valuable resource for mining.
这些铁锰结核是采矿的重要资源。
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2. The iron manganese concretions have been found in many parts of the world.
铁锰结核在世界许多地方都有发现。
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3. The iron manganese concretions are used as building materials in construction projects.
铁锰结核被用作建筑项目中的建筑材料。