“Pfaff-Birkhoff principle”的概念、定义、翻译、参考文献-科学参考

单词	Pfaff-Birkhoff principle
释义	Pfaff-Birkhoff principle Encyclopedia 理学力学变分原理释 Pfaff-Birkhoff principle普法夫-伯克霍夫原理将G.D.伯克霍夫在1927年给出的一类积分变分原理推广到包含时间的情形从而得到的积分变分原理。
随便看	culture and personality culture and social information visualization Culture and Society: 1780-1950 Culture Bookstore culture chamber Culture Committee of the Communist Party of China culture competency practice culture counting method (including dilution plate method and most probable number method) culture count method culture cycle culture differentiation culture dish culture ecological analysis culture ecology culture/education/amusement buildings culture element culture enrich culture exception culture fair test culture flask culture industry culture journalism culture map culture marginal person culture medium

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。