To wear out iron shoes; to search far and wide with great perseverance and endure numerous hardships in a quest or journey.
为了找到那本失传已久的古籍，他几乎跑遍了所有的图书馆和旧书店，真是磨穿铁鞋啊。
To find that long-lost ancient book, he almost visited all the libraries and used bookstores, truly having searched far and wide with immense effort.
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