邓飞

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I want to save a DataFrame as Excel: ``` using DataFrames Herd = [1,1,2,2,2,3,3,3,3]; Sire = ["ZA","AD","BB","AD","AD","CC","CC","AD","AD"]; Yield = [110,100,110,100,100,110,110,100,100]; dat = DataFrame(Herd=Herd, Sire = Sire, Yield = Yield); dat...