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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.
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System/370 computers represented an enormous investment, generally around a
数据显示，下沉市场用户中，使用公共充电桩充电的比例高达71.3%，有14.7%的用户日常要到远距离的城区公共充电桩充电；家庭私人充电桩拥有率仅28.7%。