No changes in text of librettos.
译本文字未改动。
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）。
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)。
Most (but not all) librettos are available on the Web in the original language, but for a variety of reasons English translations are rarely offered.
在网络上，大多数(但不是所有)的原版剧本都可以找到，但由于各种原因，英文版的却廖廖无几。
Most (but not all) librettos are available on the Web in the original language, but for a variety of reasons English translations are rarely offered.
在网络上，大多数(但不是所有)的原版剧本都可以找到，但由于各种原因，英文版的却廖廖无几。
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