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        "quote": "我们在此不深入细节，但量子场论教科书中的一个标准主题是“[<u class=\"concept-term\" data-concept-reference=\"concepts/quantum-field-theory/wick-theorem\" data-concept-identity=\"urn:uuid:d898fb1e-b187-459d-b20b-b6ab554b8983\" data-concept-route=\"/concept-identities#concept-d898fb1e-b187-459d-b20b-b6ab554b8983\" id=\"first-915860739d788cbd991f-zh\">Wick定理(Wick’s theorem)</u>](../../../../../concepts/quantum-field-theory/wick-theorem)”，它表明在态$|0\\rangle$中，场算符乘积的期望值的计算可以归结为计算以下特殊情形的问题：",
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