“北京保卫战”的概念、定义、翻译、参考文献-科学参考

单词	北京保卫战
释义	北京保卫战 Encyclopedia 历史学政治史释 The defense of Beijing北京保卫战中国明代正统十四年（1449）蒙古瓦剌部骑兵在首领也先率领下攻打明朝首都北京，明朝军民在明景帝领导、于谦主持下开展的一场首都保卫战。
随便看	mass-number conservation mass of a chain mass of a current mass of an r-vector mass of a polyhedral chain mass of a unitary representation mass of data mass of substance mass of the atom mass of the electron mass of the neutron mass of the nucleus mass of the proton mass of π-meson Masson's model Masson's pine,horsetail pine mass operator mass organizations of self-management at the grass-roots level mass oscillation mass outflow condition mass point mass point mechanics mass prediction and disaster prevention mass problem mass-produce

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。