Rust had eaten into the metal.

这金属已经锈坏。

《牛津词典》

And if they are indeed the same nails — eaten away by rust and bent at the end, almost purposefully — was their disappearance a conspiracy or a logistical slip-up?

假如千真万确是那两颗铁钉，已经锈迹斑斑且顶端弯曲，几乎故意所为，这样的失踪是蓄意密谋还是逻辑错误？

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Rust had eaten out the gun barrel.

铁锈腐蚀了枪管。

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