work hard
彼らは一生懸命に働く。
They work hard.
一生懸命に働くことに決めたんだ。
I decided to work as hard as I can.
彼は私が彼の年だったころより一生懸命に働く。
He works harder than I did when I was his age.
彼は一生懸命に働く事の重要性を強調した。
He emphasized the importance of working hard.