https://online2.tingclass.net/lesson/shi0529/0009/9907/422.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
flip a coin 拋錢(qián)幣(決定)
Let's flip a coin to see who speaks first.
讓我們來(lái)擲硬幣來(lái)決定誰(shuí)先發(fā)言。
You don't know what to do? Just flip a coin.
你完全沒(méi)辦法?那拋硬幣吧!
瘋狂練習(xí)吧!
