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Why have KFC and McDonald’s recipes remained secret for decades?

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肯德基麦当劳的配方为何能数十年不泄露？

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Ranking history & source details

First recorded Aug 24, 2026, 8:40 PM CST · latest Aug 24, 2026, 8:40 PM CST. Ranks reflect attention on each platform.

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DayPlatformBest rankLast rank
2026-08-24Zhihu Hot List#2#2
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