相变
作者通过自己从5公里到10公里的跑步突破，探讨了技能学习中的"相变"现象——进步不是线性的，而是在某个临界点突然发生质变。文章提出了两个问题：能否加速相变的发生，以及如何激励人们坚持到相变发生。
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