他提到了“克雷格广告单现象(Craigslist phenomenon)”。“克雷格广告单”是一个网上大型免费分类广告网站，人们可以免费贴出广告，最终，它被美国城市所接纳。
He refers to the "Craigslist phenomenon" - the classifieds website that makes it free to post adverts and has, as a result, become woven into the fabric of urban America.
本文讨论的主题是单例模式，请将上述实现方式牢记于心，因为接下来的现象可能出现在任何一种实现方式中。
As I discuss the singleton, keep the above implementations in mind, although many of those phenomena can occur for any implementation of the singleton.
在讨论了如何实现单例模式之后，我会逐一介绍这些时而出现的诡异现象，讲解它们是怎么出现的以及如何去避免犯错。
After discussing how to implement the singleton, I'll go over the sometimes surprising causes for the phenomena one by one, showing you how they occur and how you can avoid making those mistakes.
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