試行錯誤は進歩に不可欠だ。
tbd
Trial and error is essential to progress.
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試行錯誤の末、彼はふと正しい答えを思いついた。
tbd
Through trial and error, he found the right answer by chance.
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解決策が功を奏したのは試行錯誤の結果だった。
tbd
Finding a solution that worked was a process of trial and error.
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