名詞 “masterpiece”
 単数 masterpiece、複数 masterpieces
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 The Mona Lisa is often regarded as Leonardo da Vinci's masterpiece, captivating millions with her enigmatic smile. 
- 名作 (職人がその技能を示し、達人と認められるために作った作品を指す場合)After years of training, the young carpenter presented a beautifully carved oak chair as his masterpiece to the guild, hoping to be recognized as a master craftsman.