1.歌剧脚本
1.the words of an opera
1.All four librettos reprinted with a different typeface (which I feel is more readable) for stage directions.
四个译本分别采用不同的字体刊登（我认为这样会更具可读性）。
2.Source material: Primary source for all four librettos is Schott's 1899 vocal scores (republished in the United States by Schirmer in 1904).
资料来源：四个版本都来源于1899年Schott出版的歌谱（该歌谱1904年在美国由Schirmer再版）。
3.He always halted in the district where by night are found the lightest streets, hearts and librettos.
他总是选择这样的地方停下来。那里到晚上有最明亮的街道，最愉快的心境和最轻松的歌曲。
4.Legacies of the Kunqu theatre are librettos from the Ming and Qing periods (1644-1911).
昆曲来源于明清时代（1644-1911）的戏曲。
5.No changes in text of librettos.
译本文字未改动。
6.Some librettos, for example, are still very popular today.
有些歌词直到今天依然很流行。