有关coal的知识

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Save half of the coal

04-18
Asmarthousewifewastoldthattherewasakindofstovewhichwouldonlyconsumehalfofthecoalshewasburning.Shewasveryexcited,andsaid:"That'llbeterrific!Sinceonestovecansavehalfofthecoal,ifIbuytwo,nocoalwillben...