初期科室很简单：手术科、诊断服务科、麻醉科，还有1973年独立出来的护理协调部门，主要提供急诊、心脏护理、手术和康复服务，床位也从最初计划的61张，扩展到355张。为了贴合老人需求，医院还引入了家庭护理项目，把顶层空间改造成健康教育等多功能区域——本质就是“老人需要什么，就补什么”。
The Writer is not a concrete class. Any object that implements write(), end(), and abort() can be a writer making it easy to adapt existing APIs or create specialized implementations without subclassing. There's no complex UnderlyingSink protocol with start(), write(), close(), and abort() callbacks that must coordinate through a controller whose lifecycle and state are independent of the WritableStream it is bound to.
。关于这个话题，safew官方下载提供了深入分析
激活函数的作用 激活函数在每个神经元输出前进行非线性变换，让网络可以拟合复杂的函数关系，从而解决分类、回归等非线性问题。
Optical-based smoke alarms use light instead. They are slightly better at detecting the large smoke particles created by slow, smouldering fires. When such particles enter a chamber in the device, they scatter light from a small light source, which is then picked up by a photoelectric sensor.