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predecessor; pioneer; ancestor
先人の知恵を学ぶことは大切だ。
Learning from the wisdom of those who came before us matters.
先人が切り開いた道を私たちは歩んでいる。
We walk the path that our predecessors carved out.
先人たちの努力があって今の生活がある。
Our current way of life exists thanks to the efforts of those before us.