https://online2.tingclass.net/lesson/shi0529/0009/9907/269.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
roll up our sleeves 撸起袖子
roll up 卷起来
sleeve 袖子
Let's roll up our sleeves and work hard.
让我们撸起袖子加油干!
I always like to roll up my sleeves, it looks cool.
我一般喜欢把衣服袖子卷起来，因为这样看起来酷。
疯狂练习吧!
