短語詞組短語variation n principle 變分法原理functional variation al principle 泛函變分法mechanical variation principle 力學的變分原理probabilistic variation principle 概率變分原理complementary energy variation principle 餘能變分原理classical variation principle 經(jīng)典變分原理functional variation principle 泛函變分原理variation principle of energy 能量變分原理complementary variation principle 互補變分原理 返回 variation principle