“constrained Birkhoff system”的概念、定义、翻译、参考文献-科学参考

单词	constrained Birkhoff system
释义	constrained Birkhoff system Encyclopedia 理学伯克霍夫力学释 constrained Birkhoff system约束伯克霍夫系统普法夫-伯克霍夫原理中的变分不是彼此独立时对应的系统。
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