bya

别名

Bya BYA

释义与例句

sym.
  1. 1.

    Abbreviation of billion years ago (A symbol for a unit of measure.)

    Synonym of Gya (“billion years ago (short scale): 10⁹ years ago”).

  2. 2.

    Abbreviation of billion years ago (A symbol for a unit of measure.)

    billion years ago (long scale):10¹² years ago: a trillion years ago (short scale).

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