iron alum

例句：

1. 1.The iron is hot enough to melt the steel.
   这把铁足够热，能把钢熔化。
2. 2.He worked tirelessly to iron out the flaws in his report.
   他努力不懈地修改报告上的缺陷。
3. 3. The iron gates are intricately designed to keep out intruders.
   这些铁门设计得非常复杂，用来阻止入侵者。