For implementers, backpressure adds complexity without providing guarantees. The machinery to track queue sizes, compute desiredSize, and invoke pull() at the right times must all be implemented correctly. However, since these signals are advisory, all that work doesn't actually prevent the problems backpressure is supposed to solve.
到1988年，为了服务新兴的Sun City West分区，Sun Health基金会捐赠900万美元，建成了Del E. Webb Memorial Hospital（现名Banner Del E. Webb Medical Center），同样以老年护理为核心，和第一家医院形成互补，覆盖更多退休居民。
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The radio silence that accompanies re-entry went on far longer than normal. Millions watched on TV, many convinced that all was lost.