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1. Oxford American Dictionary

   erratic

   • IPA[əˈradik]

   美式

   • adj.
     not even or regular in pattern or movement; unpredictable
   • n.
     a rock or boulder that differs from the surrounding rock and is believed to have been brought from a distance by glacial action

   • noun: erratic, plural noun: erratics

2. • 釋義

   adj.

   形容詞

   • 1. not even or regular in pattern or movement; unpredictable her breathing was erratic

   n.

   名詞

   • 1. a rock or boulder that differs from the surrounding rock and is believed to have been brought from a distance by glacial action the source of stone for the whetstones may have been glacial erratics