名词
中文翻译：Unknown
同义词：
['black iron', 'blackcast iron']
例句：
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1.The blackened steel was used to makethe bridge.
这种黑钢被用来制作桥梁。
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2. The blackened steel is very strongand durable.
这种黑钢非常坚固耐用。
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3.The blackened steel was used in theconstruction of the new building.
这种黑钢被用于新建筑的建设。