短语
中文翻译：像铁一样坚硬
同义词：
['hard as nails', 'as solid as steel例句：1. The car was so old that it was as hard as iron.（这辆车太旧了，就像铁一样硬。）']
例句：
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1. The car was so old that it was as hard as iron.
这辆车太旧了，就像铁一样硬。
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2.He worked tirelessly to make the project as hard as iron.
他努力不懈地工作，使项目像铁一样坚固。
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3.The metal is as hard as iron and cannot be easily bent.
这种金属像铁一样硬，不容易弯曲。