...improvisar, to improvise, extemporize... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...They attend at public rejoicings, and at births, deaths, and marriages of great personages, upon which occasions they extemporize their songs according to circumstances...
Samuel White Baker 「In the Heart of Africa」
ランダム例文：
maggot beatings Glendive
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この漢字は何でしょう？？