彼は非常に勤勉な学生です。
He is a very diligent student.
日本人は勤勉だとよく言われる。
It is often said that Japanese people are hardworking.
祖父は勤勉に働いて家族を養った。
My grandfather worked diligently to support his family.
彼女の成功は長年の勤勉の賜物だ。
Her success is the fruit of many years of hard work.