like: an iron → →
to have an iron constitution ☊ 
mình đồng da sắt ☊ He smashed the window with an iron bar. ☊ bar ☊
an iron gate ☊ gate ☊
an iron and steel works ☊ iron ☊
to have an iron will/a will of iron ☊ will ☊
to have an iron constitution ☊ mình đồng da sắt ☊