https://online2.tingclass.net/lesson/shi0529/0009/9907/749.mp3
https://image.tingclass.net/statics/js/2012
講解文本：
self-discipline 自律，自我修養(yǎng)，自我訓(xùn)練
This book is about how to build self-discipline.
這本書是講如何自律的。
Exercising at home requires self-discipline.
自己在家鍛煉需要很強(qiáng)的自我約束能力。
