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1·The soldier was as hard as nails.

这位战士身体如铁打一般的强健。

2·They are merciless, with hearts as hard as nails.

他们冷酷无情，铁石心肠。

3·They offered me a good job at that company but I hear that the boss is as hard as nails.

他们向我提供那家公司的一个很好的职位，但是我听说他们的老板是个很难相处的人。

4·They offered me a good job at that company but I hear that the boss is as hard as nails. So I've not decided yet.

他们向我提供那家公司的一个很好的职位，但是我听说他们的老板是个很难相处的人。所以我还没决定去不去。