三、核心支撑：两大基金会，不止是给钱那么简单Sun City的医疗体系能稳定运转、持续升级，背后离不开两大基金会的支撑——J.G. Boswell基金会（1947年成立）和Sun Health基金会（1968年成立）。它们的作用，远不止“给钱”那么简单，而是渗透到医疗体系的资金、运营、创新等每一个环节。
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Forgetting releaseLock() permanently breaks the stream. The locked property tells you that a stream is locked, but not why, by whom, or whether the lock is even still usable. Piping internally acquires locks, making streams unusable during pipe operations in ways that aren't obvious.