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1. Oxford American Dictionary

   picosecond

   • IPA[ˈpīkōˌsek(ə)nd]

   美式

   • n.
     one trillionth of a second

   • noun: picosecond, plural noun: picoseconds

2. • 釋義

   n.

   名詞

   • 1. one trillionth of a second the first picosecond of the Big Bang