https://online2.tingclass.net/lesson/shi0529/0009/9907/746.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
instruct 指導，教
instructive 有指導意義的，有教育性、啟發(fā)性的
Mike's answer is very instructive.
麥克的回答很有指導意義。
Mary is the best teacher in our school. I like her instructive lessons.
瑪麗是我們學校最好的老師，我很喜歡她那些很有啟發(fā)性的課程。
