名词
中文翻译：黑火药
同义词：
['black gunpowder', 'black gunpowder']
例句：
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1.The soldiers used black powder to create a loud noise for signaling.
士兵们使用黑火药制造出响亮的声音来传递信号。
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2.Black powder was widely used in the past as an explosive.
黑火药在过去广泛用作爆炸物。
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3.The black powder was stored safely in a locked cabinet.
黑火药被安全地存放在一个锁着的柜子里。