As I lift the mailbox door, I feel its cold iron.

提起邮箱的门，我感觉到了它寒冷的铁。

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Not only can the art bring happiness to others, but it also shows that even cold, hard iron can be back to life with a little creativity.

艺术不仅可以给别人带来快乐，而且它还表明，即使是冰冷、坚硬的铁，也可以用一点创造力恢复生机。

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Cold hands and feet: The sign of iron deficiency?

手足冰冷是缺铁的信号吗？

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Given the different contractions of the two different metals as a result of the cold, when it gets cold enough iron cannonballs will fall off a brass monkey.

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It would take cold, hard steel, made from hot molten iron.

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It was also a symbol of hope during the cold war, a place where scientists from both sides of the iron curtain could work together on peaceful projects.

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