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一生懸命に働いた

worked hard

→ 一生懸命
phrase Rare #45,475
worked hard 一生懸命に means “with all one’s effort” or “as hard as one can.”
JA: 彼女は試験に合格するために一生懸命に働いた。
EN: She worked hard to pass the exam.

彼は、家族を養うために一生懸命に働いた。

He worked hard to support his family.