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        "quote": "由于在 $\\partial$ $D$ 上 $\\delta \\Phi _ { A } = 0$，故其为零。由于 $\\delta \\Phi _ { A }$ 是 $D$ 上的任意函数（受此边界约束），我们推出 <u class=\"concept-term\" data-concept-identity=\"urn:uuid:6a6a990b-27e1-42a4-8591-59e8db4625bd\" data-concept-route=\"/concept-identities#concept-6a6a990b-27e1-42a4-8591-59e8db4625bd\" id=\"first-36d920412fa399f99205-zh\">欧拉–拉格朗日场方程(Euler–Lagrange field equations)</u>",
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