iron-bound
/ˈaɪənbaʊnd/adjective
1- bound with iron包铁的：
an old iron-bound chest.
一个包铁的旧箱柜。
1.1
- rigorous; inflexible严格的, 严厉的; 不可改变的, 刻板的：
the iron-bound rules concerning the release of classified information.
关于公布保密情报的严格规定。
1.2
- archaic (of a coast) faced or enclosed with rocks〈古〉（海岸）岩石围绕的。