https://online2.tingclass.net/lesson/shi0529/0009/9907/321.mp3
https://image.tingclass.net/statics/js/2012
讲解文本：
child's play 小儿科，非常简单的工作，轻而易举的事
Come on, this is like child's play. Even a baby can do this.
啊，这太简单了，一个baby都能搞定。
I finished the test very quickly. It was child's play!
我很快就完成了测试，太小儿科了。
疯狂练习吧!
