https://online2.tingclass.net/lesson/shi0529/0009/9907/209.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
play it by ear 见机行事，随机应变
Let's play it by ear when we get there.
到了那儿，我们再见机行事。
We should have a plan for tomorrow, or we will have to play it by ear.
我们应该准备一个计划，不然只能走一步算一步了。
疯狂练习吧!
