Lesson One Introduction all human activities which can be pursued at the individual level,learning is the most gratifying and fulfilling.Because learning can expand our experience,horizons and productivity,it is cumulative.Because the body decays,learning is the only human pleasure that is lasting;it remains with us for a lifetime. 恶肠 第一课简介 Lesson One Introduction all human activities which can be pursued at the individual level, learning is the most gratifying and fulfilling. Because learning can expand our experience, horizons and productivity,it is cumulative. Because the body decays, learning is the only human pleasure that is lasting; it remains with us for a lifetime. 第一课 简介