cast iron例句

They would have to offer cast-iron guarantees to invest in long-term projects.
他们需提供绝对可靠的担保，才能投资长期项目。

Made from cast iron, it is finished in graphite enamel.
它是用铸铁制成，最后在外面搪了一层石墨。

Cast iron cannot compare with steel in strength.
铸铁在强度方面比不上钢.