| 单词 | siderography | 
| 释义 | siderographynoun  sid·er·og·ra·phy    ˌsidəˈrägrəfē      plural -es      : the art of engraving steel    especially : a process of multiplying facsimiles of an engraved steel plate by rolling over it when hardened a soft steel cylinder and then rolling the cylinder when hardened over a soft steel plate    | 
	
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