al·le·gro /əˈlɛ(ˌ)gro, ˈle-/
  (ad.)急速地(a.)快速的急速的樂章
  Al·le·gro a.  Mus. Brisk, lively.  -- n. An allegro movement; a quick, sprightly strain or piece.
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  allegro
       adj : (of tempo) fast
       n 1: a brisk and lively tempo
       2: a musical composition or passage performed quickly in a
          brisk lively manner
       adv : in a quick and lively tempo; "play this section allegro"