父は定年まで三十年間その会社に精勤した。
My father served the company diligently for thirty years until he retired.
長年の精勤が認められ、社長から表彰された。
His many years of diligent service were recognized with a commendation from the president.
彼女は一年間よく精勤し、精勤賞をもらった。
She kept up good attendance all year and received an award for it.