https://online2.tingclass.net/lesson/shi0529/0009/9907/765.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
stubborn 頑固的，倔強(qiáng)的，難去除的
That stubborn man never changes his mind.
那固執(zhí)的人從不會(huì)改變想法。
I have a stubborn cold and cough day and night.
我得了很難治的感冒，日夜咳嗽。
