名词
中文翻译：中等大小的煤
同义词：
['medium-sized bituminous coal', 'medium-sized anthracite coal']
例句：
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1. The mine producesmedium-sized coal for industrial use.
该矿生产用于工业的中等大小的煤。
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2.The coal is mined from the medium-sized coal seam in the mountain.
这种煤是从山上的中等大小的煤层中开采出来的。
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3. Coal mining is a major industry in this region, with medium-sized coal being the main product.
该地区的煤炭开采是主要产业，中等大小的煤炭是主要的产出物。