An electrician works on a generator system at One Wilshire, a Los Angeles building that has been converted into a data center.Genaro Molina—Los Angeles Times/Getty Images
当配置变更（Config 对象引用变化）时，WeakMap 的键失效，缓存自动失效。不需要显式清除——这是 WeakMap 的自动 GC 特性，优雅地解决了缓存失效问题。。电影对此有专业解读
It encapsulates its data, which is accessible only through the public API.。PDF资料对此有专业解读
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So because these things become knowable, because these things are not quite the same as news, I think there’s some sense in which they become easier to bet on. If you know there’s going to be a debate and you know there’s going to be a snap poll after the debate, you can bet on who’s going to win the snap poll after the debate to say who won the debate.