名词
中文翻译：硬煤
同义词：
['coal', 'bituminous coal']
例句：
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1.The hard coal mine is located in the mountains.
这个煤矿位于山区。
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2. Hard coal is a type of coal that is harder and more durable than other types.
硬煤是一种比其它类型的煤更硬、更耐用的煤炭。
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3. The hard coal mining industry has been declining due to environmental concerns.
由于环境问题，硬质煤开采行业一直在下降。