translation.en: So 90 percent of what I do with my five hours of prep time per week is to take fairly compelling elements of problems like this from my textbook and rebuild them in a way that supports math reasoning and patient problem solving.
translation.zh: 所以我做的90％的事 和我每周5小时的准备时间 是拿问题中非常吸引人的元素， 像在我的教科书里的这些问题， 把它们重组成能支持数学推理和耐心解决问题的方法。