他们大多是社区里的退休居民，用无偿服务，既降低了医院的运营成本，也给老年患者带来了专属的温暖。
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，这一点在服务器推荐中也有详细论述
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'Postcode lottery' of rubbish
Human brain cells on a chip learned to play Doom in a week
· 孙亮 · 来源：beijing资讯