ephemeronn.
英 ɪ'femərɒn | 美 ɪ'fɛmə,rɑn
中文n. 蜉蝣；生命极短暂的东西
词根词源
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.
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