cast iron
hard alloy of iron made by casting in a mould 铸铁; 生铁. Cf 参看 wrought iron (wrought). ,cast-`iron adj
1 made of cast iron 铸铁制的; 生铁造的.
2 (fig 比喻) very strong; that cannot be broken 强壮的; 打不破的
He has a ,cast-iron consti`tution. 他的身体是铁打的.
They won't find her guilty. She's got a,cast-iron de`fence. 他们无法给她定罪. 她的答辩无懈可击.