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  1. PyDict

    femtometer

    • 非姆托米
  2. 知識+

    • nuclear radius

      Nuclear radius ~ 10-15 m or 1 fm (femtometer or fermi)   Atomic radius ~ 10-10 m or 10-8 cm or 1 Å (1 angstrom).   So, ratio of atomic radius to nuclear radius is approximately 100,000.