“Bronze Gun with the Inscription“Tianzi”of the Yongle Reign,Ming Dynasty”的概念、定义、翻译、参考文献-科学参考

单词	Bronze Gun with the Inscription“Tianzi”of the Yongle Reign,Ming Dynasty
释义	Bronze Gun with the Inscription“Tianzi”of the Yongle Reign,Ming Dynasty Encyclopedia 历史学中国古代科技文物释 Bronze Gun with the Inscription“Tianzi”of the Yongle Reign,Ming Dynasty明永乐“天字”铜手铳中国明代永乐十九年（1421）制轻型火铳。
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