librettos
n.
（歌剧等的）剧本( libretto的名词复数 );
例句:
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And needless to say, I would love to be of assistance in translating opera librettos.
不用说, 我也愿意协助翻译京剧唱词.
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Despite all the changes, the new librettos remained as trifling as those of operetta and as loosely bound as a revue's.
来自NEWYORKER