名词
中文翻译：煤炭机械
同义词：
['coal-powered machinery', 'coal-operatedmachinery']
例句：
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1. The coalmachinery is essential for the operation of themine.
煤炭机械对于矿井的运行至关重要。
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2.The new coal machinery has greatly improved theefficiency of the mining process.
新型煤炭机械大大提高了采矿过程的效率。
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3. Thecoal machinery was designed toreduce the risk of accidents inthe mine.
煤炭机械被设计来减少矿井中事故的风险。