https://online2.tingclass.net/lesson/shi0529/0009/9907/560.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
keep up the pace 保持步调，跟上步伐，跟上脚步
You have to work very hard to keep up the pace.
你必须非常努力才能够跟上脚步。
Mike was unable to keep up the pace. He was out.
麦克跟不上脚步，他出局了。
疯狂练习吧!
