The libretto of an opera is the words that are sung in it.

歌剧的歌词是演唱的词

The author of a libretto.

大家一起唱棕色的歌词！

The author of a libretto.

另一组唱黑色的歌词。

The printed libretto was handsomely got up.

这本印刷的歌剧剧本装帧得很美观。

Or something along the lines of the dual-screen Toshiba Libretto?

或者沿用东芝Libretto的双屏幕么？

The screen is much bigger than the libretto and comes with custom software. this.

这块屏幕比libretto大许多，并且使用通用版软件。