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Where did the phrase "balls of steel" originate from? : r/AskReddit
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I've got balls of steel"是什麼意思？ - 關於英語(美國)（英文）的問題| HiNative
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What is equivalent of the phrase “Balls of Steel” but for women? - Quora
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Balls-of-steel Definition & Meaning | YourDictionary
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