https://online2.tingclass.net/lesson/shi0529/0009/9907/560.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
keep up the pace 保持步調(diào)，跟上步伐，跟上腳步
You have to work very hard to keep up the pace.
你必須非常努力才能夠跟上腳步。
Mike was unable to keep up the pace. He was out.
麥克跟不上腳步，他出局了。
瘋狂練習(xí)吧!
