在过去的20年中，蔡伟从未停止过自学，他的大部分收入都用在买书上了。
During the past 20 years, Cai Wei never stopped self-study and most of his income was spent on books.
蔡女士的方法中，有什么科学根据吗？
蔡女士的方法中，有什么科学根据吗？她表示自己那种极端的教育方式给她的两个女儿带来了学业上的成功。
Is there any scientific support for Chua's methods? She suggests that her intense parenting brought academic success to her two daughters.
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