/ˌkɑːstˈaɪən/ adj.1.(made of cast iron)+ casserole, frying pan, fireplace, bath, railings铸铁制的
2.(effective, reliable)+ guarantee, assurance, case, excuse, alibi绝对可靠的；肯定有效的：必然兑现的
They would have to offer cast-iron guarantees to invest in long-term projects.他们必须确定无疑地保证会投资长期项目。
Phone records have provided them with a cast-iron alibi.电话记录给他们提供了不在犯罪现场的铁证。
3.(very strong)+ constitution, stomach, nerves健壮的；强健的；坚强的