cor·ol·lary /ˈkɔrəˌlɛri, ˈkɑr, ||kəˈrɑləri/
  系,推論,必然的結果
  Cor·ol·la·ry n.; pl. Corollaries
  1. That which is given beyond what is actually due, as a garland of flowers in addition to wages; surplus; something added or superfluous. [Obs.]
  Now come, my Ariel; bring a corollary,
  Rather than want a spirit.   --Shak.
  2.  Something which follows from the demonstration of a proposition; an additional inference or deduction from a demonstrated proposition; a consequence.
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  corollary
       n 1: a practical consequence that follows naturally; "blind
            jealousy is a frequent corollary of passionate love"
       2: (logic) an inference that follows directly from the proof of
          another proposition