li·bret·to /ləˈbrɛ(ˌ)to/
  歌詞集,歌詞
  Li·bret·to n.; pl. E. Librettos It. Libretti   Mus. (a) A book containing the words of an opera or extended piece of music. (b) The words themselves.
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  libretto
       n : the words of an opera or musical play
       [also: libretti (pl)]