https://online2.tingclass.net/lesson/shi0529/0009/9907/542.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
shake a leg 趕緊，趕快，趕緊走
Come on, shake a leg, you're going to be late for school.
拜托，趕緊的，你上學(xué)要遲到了。
Let's shake a leg. They are waiting for us!
我們趕快，他們在等著呢。
瘋狂練習(xí)吧!
