https://online2.tingclass.net/lesson/shi0529/0009/9907/513.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
let me know 告诉我，让我知道
If you need anything, just let me know.
有任何需要，都请告诉我。
Whatever happens to him, let me know at once.
不管他发生什么事情，请立刻通知我。
疯狂练习吧!
