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unleaded (adj.)
[unleaded 词源字典]
1610s, "having no lead," from
un-
(1) "not" +
leaded
(see
lead
(v.2)). In reference to gasoline, from 1965. In reference to printing, from 1902.
[unleaded etymology, unleaded origin, 英语词源]
[unleaded 词源字典]