资料来源 : WordNet®

2nd
     adj : coming next after the first in position in space or time or
           degree or magnitude [syn: {second}, {2d}]

资料来源 : Free On-Line Dictionary of Computing

2.PAK
     
         An {artificial intelligence} language with
        {coroutine}s.
     
        ["The 2.PAK Language: Goals and Description", L.F. Melli, Proc
        IJCAI 1975].
     
        (1995-01-25)