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invaluable (adj.)
[invaluable 词源字典]
1570s, "above value," from
in-
(1) "not" +
value
(v.) "estimate the worth of" +
-able
. It also has been used in a sense "without value, worthless" (1630s).
[invaluable etymology, invaluable origin, 英语词源]
[invaluable 词源字典]