一、从无到有：Sun City医疗体系的进化之路Sun City 由Del Webb公司创办，定位是“活跃退休人士社区”。但它的医疗服务，并非一开始就配齐，而是跟着居民需求，一步步迭代升级，大致分为四个阶段。
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"To some people, this is tantamount to, 'we own this bit of the moon, we're going to operate here and and you can't come in'," he explains.
Backpressure — the ability for a slow consumer to signal a fast producer to slow down — is a first-class concept in Web streams. In theory. In practice, the model has some serious flaws.