ephemeron

英 [ɪ'femərɒn] 美 [ɪ'fɛmə,rɑn]
  • n. 蜉蝣；生命极短暂的东西
ephemeron
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英文词源

ephemeron (n.)
"insect which lives for a very short time in its winged state," 1620s, from Greek (zoon) ephemeron, neuter of adjective ephemeros "living but a day" (see ephemera). Figurative use by 1771.