Copper nails are better than iron nails because the iron rusts.

铜钉比铁钉好，因为铁钉会生锈。

《柯林斯英汉双解大词典》

We need iron nails of all sizes.

我们需要各种尺寸的铁钉。

youdao

We need iron nails of all sizes.

咱们需要各种尺寸的铁钉。

youdao

At Kew, a pile of large iron nails rusted together show that boat building and repair went on, and pieces of 17th-century slipware mingle with Tudor pot handles.

BBC: London from the tide line

Archaeologists said one of the most notable burials was a grave that contained the skeletons of two individuals which were closely flexed together, and the discovery of a number of iron nails around the edge of two of the graves, suggesting the bodies were buried inside coffins.

BBC: Archaeological dig uncovers Roman activity near Stroud