浪费还是节约

Father: Oh, Jack, you have slept away the whole morning. Don't you know you are wasting time?
Jack: Yes, Dad. But I've saved you a meal, haven' I?

父亲：噢，杰克，你又睡了一上午。难道你不知道你这是在浪费时间吗？
杰克：我知道，爸爸。可我还给您节省了一顿饭呢，是不是？