A secret recipe, formula, or method that has been passed down through generations within a family, often leading to unique or superior results.
这家老字号的糕点店，据说靠着一份祖传秘方，做出了闻名遐迩的特色糕点。
This long-established pastry shop is said to rely on an ancestral secret recipe to create its renowned specialty pastries.
Era:
Modern
Frequency:
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