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ephemeral (adj.)
[ephemeral 词源字典]
1560s; see
ephemera
+
-al
(1). Originally of diseases and lifespans, "lasting but one day;" extended sense of "transitory" is from 1630s. Related:
Ephemerally
;
ephemerality
.
[ephemeral etymology, ephemeral origin, 英语词源]