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2071 zjchen 1 
!! +exec+ +var+ +string+
11219 bpr 2 
tit:varlist
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type:$type_both
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alias:listvar
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syntax:!varlist [nofn] `formula'
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mean:对数学式的操作: 返回出现在 `formula'\
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  里的变量名(以及函数名)表. <p>\
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  如果开关 `nofn' 被设置, 函数名将不被列举.