(记者 周艳涛)人们常说"某人不是省油的灯"，来形容其厉害、刻薄。然而，在古代，人们还真使用过"省油灯"，这种灯还真的挺省油、挺节能。 而省油灯是何时发明的呢？以前人们多认为是唐宋时期所发明，然而近日西安市政府参 ... 省油灯 汉代就有了(图)
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