英语笑话 KeystooneSuccess

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　　One day a father was teaching his son and said, "The keys to your success are keeping your word and cleverness.

　　Once you promise somebody a promise, you must carry it out on matter what will happen. This is called ’keeping one’s word.’

　　"What is cleverness? asked his son.

　　"Cleverness is that you’ll never make such a promise, " the father answered.