“The defense of Beijing”的概念、定义、翻译、参考文献-科学参考

单词	The defense of Beijing
释义	The defense of Beijing 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	mixing efficiency mixing encryption mixing entropy mixing fog mixing heat mixing heater mixing layer mixing layer experiment mixing length mixing length theory mixing measure mixing; milling mixing of a tensor mixing of rubber compounds mixing ordering mixing plant for bituminous mixture mixing problem mixing property mixing ratio mixing rule of composite materials mixing stochastic process mixing tank of coordination treatment of phosphate mixing theorem mixing time mixing transformation

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