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单词 leap second
释义

WordReference Random House Unabridged Dictionary of American English © 2024
leap sec′ond, 
  1. Timean extra second intercalated into the world's timekeeping system about once a year, made necessary by the gradual slowing down of the earth's rotation.
  • 1970–75

Collins Concise English Dictionary © HarperCollins Publishers::
leap second n
  1. a second added to or removed from a scale for reckoning time on one particular occasion, to synchronize it with another scale
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