The recipe for their drink is a closely guarded trade secret.
他们饮料的配方是严格保守的商业秘密。
My grandmother's recipe for chocolate cake is a secret.
我奶奶的巧克力蛋糕的配方是个秘密。
My father had a secret recipe for noodle soup. This is how we became the best noodle restaurant in town!
我爸爸有这汤面的独门秘方。就是这样我们成了本地最有名的面店！
My father had a secret recipe for noodle soup. This is how we became the best noodle restaurant in town!
我爸爸有这汤面的独门秘方。就是这样我们成了本地最有名的面店！
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