名词
中文翻译：硬铁
同义词：
['hard steel', 'hard metal例句：1. The car was made of hard iron.（这辆车是用硬铁做的。）']
例句：
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1. The car was made of hard iron.
这辆车是用硬铁做的。
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2.Hard iron is much stronger than soft iron.
硬铁比软铁更坚固。
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3. The hard iron door is heavy and difficult to open.
这扇硬铁门很重，很难打开。