n.轻歌剧，小歌剧...

The operetta become more and more popular.小歌剧越来越流行。...

operetta的音标：operetta的英式发音音标为：[ˌɒpə'retə]operetta的美式发音音标为：[ˌɑpə'retə]...

operetta的复数形式为：operettas...