In many important areas, from the obsidian industry to religious tourism, Teotihuacán's success and prosperity typified the classic positive feedback cycle.
在许多重要的领域，从黑曜石产业到宗教旅游，特奥蒂瓦坎的成功和繁荣是典型的正反馈循环。
Set up a positive feedback cycle for single-tasking focus and you'll reverse the years of training your mind has gotten to switch tasks. You'll get more important work done, and it won't seem hard.
当建立起正面的反馈循环机制，经过一段时间训练，你就能适应任务的转换，担当重要的工作，并战胜各种困难。
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