“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	slip coefficient slip-down operator slip factor slip-flow regime slipform slip-form concrete paver slip frequency Slipher crater slip knot slip length slip-line field slip-line field method slip line method slip method of analysis slip modulus slip moment slipmouth pongfish slip of dislocation slip of the tongue slip-on diaphragm slippage slippage effect slippage test slipped sandwich structure slipper

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