There was a glass partition through which we could watch the bright brass pistons.
2
靖难之役的相关史料，安国的铜活字印书，《魏源集》失收的文章等都是珍贵的历史文献资料。
Related historical materials about the compaign of Jingnan, printed books copper type, and the answer sheets of imperial examination by Weiyuan are all rare historical literature materials.
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