1.

1. 铁定的：ironbound 坚硬的 | ironclad 铁定的 | ironer 烫衣工

2. 铁壳的：ironclad switchgear 铁壳开关装置 | ironclad 铁壳的 | ironclad 装甲的;铁甲舰

1. 绝对可靠的;天衣无缝的;万无一失的
    If you describe a guarantee or plan as ironclad, you are emphasizing that it has been carefully put together, and that you think it is absolutely certain to work or be successful.

    e.g. ...ironclad guarantees of safe passage...
           安全通行的绝对保证
    e.g. The case for testing now is ironclad.
           正在接受检验的这一论据牢不可破。

1. a wooden warship of the 19th century that is plated with iron or steel armor

1. inflexibly entrenched and unchangeable

    e.g. brassbound traditions
           brassbound party loyalists
           an ironclad rule

    Synonym: brassbound

2. sheathed in iron plates for protection