名词
中文翻译：煤炭特性
同义词：
['coal properties', 'coal characteristics']
例句：
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1. The coal mine is located inthe northern part of the country.
煤矿位于该国北部。
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2. Coal is a major sourceof energy for many industries.
煤炭是许多行业的主要能源来源。
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3. The coal mine hasbeen closed due to safety concerns.
由于安全担忧，煤矿已经关闭。