improvement
说“…上的进步”在improvement后面接in。例如：He is showing some improvement in health. 和I am glad to hear of your improvement in English. 说“比…好的事物”在improvement后接on或upon或over。例如：This poem is an improvement (up) on（或over）that.和The present typist is an improvement (up) on（或over）the last.
