我维护了一份专门的问题树文档。这里面不是一个简单的待办清单，记录了整个问题空间的动态演化：一个大问题在研究推进中会衍生出若干子问题，子问题解决了一部分，又暴露出新的未知，新的未知再裂变成更具体的小问题。这棵树完整地记录了这个裂变过程。
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，这一点在heLLoword翻译官方下载中也有详细论述
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From his first days in office, Hall talked about replacing the jail, but he knew that it would take years to accumulate the political power to do it. He continued to improve the facility, introducing treatment programs and cutting down on overcrowding, thereby earning the praise of Nashvillians—among them Friedmann, now out of jail. He’d moved back to Nashville to become an activist and journalist. “If you want to effect change you have to do it yourself,” he told me. In a 2003 letter to the Tennessean, Friedmann wrote that “Hall should be commended for taking steps to ensure a safe and humane environment at the jail.”。关于这个话题，PDF资料提供了深入分析
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