https://online2.tingclass.net/lesson/shi0529/0009/9907/542.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
shake a leg 赶紧，赶快，赶紧走
Come on, shake a leg, you're going to be late for school.
拜托，赶紧的，你上学要迟到了。
Let's shake a leg. They are waiting for us!
我们赶快，他们在等着呢。
疯狂练习吧!
