iron,铁，clad,覆盖的。即铁覆盖的，引申词义装甲的，可靠的。

1. That is an ironclad fact that is beyond controversy.

这是铁的事实,无庸置辩.

来自《简明英汉词典》

2. These ironclad details are irrefutable proof in black and white.

白纸黑字,铁证如山.

来自《现代汉英综合大词典》

3. The case for testing now is ironclad.

正在接受检验的这一论据牢不可破。

来自辞典例句

4. Actually, these selection rules are not ironclad.

实际上, 这些选择规则并不是严格的.

来自辞典例句

5. Britain � � s first seagoing ironclad warship, HMS Warrior, was launched.

英国第一艘远洋装甲战艇“勇士号”下水.

来自互联网