His eyes were as hard as flint.

他的眼神冷酷无情。

《牛津高阶英汉双解词典》

The rock here was as hard as flint.

这里的岩石像燧石一样坚硬.

《简明英汉词典》

He has a heart as hard as flint.

他有一副铁石心肠.

《简明英汉词典》

She gave him a look as hard as flint.

她冷酷地瞪他一眼.

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He is as hard as flint where business is concerned.

他在生意上是冷酷无情的.

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He is as hard as flint where business in concerned.

在买卖上面他是冷酷无情的.

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