短语
中文翻译：像燧石一样坚硬
同义词：
['hard as a rock', 'as solid as a rock']
例句：
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1.The car was so old that it was as hard as flint to start it.
这辆车太旧了，启动它就像燧石一样困难。
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2. He is as hard as flint in his work, never giving up until the job is done.
他在工作上非常坚韧，从不放弃直到任务完成。
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3.The rocks were so hard that they were as hard as flint.
这些岩石非常坚硬，就像燧石一样。