https://online2.tingclass.net/lesson/shi0529/0009/9907/78.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
keep it down 小点声，保持安静
Keep it down, the kids are sleeping.
小声点，孩子们睡了。
Could you keep it down, please? I am doing my homework.
请小声点，好吗?我在写作业呢。
疯狂练习吧!
