楽観主義者
(mathematics) equivalence class
optimist
薩埵: sentient beings; bodhisattva
(archaic) second division of the night, about 9 p.m. to 11 p.m.; 2nd watch / about 10 p.m. / (archaic) second division of the night, about 9 p.m. to 11 p.m.; 2nd watch
He is always an optimist, believing in a bright future even in difficult situations.
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