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.
However Nasa's lunar plans have a major missing part - the lander that will take astronauts to the Moon's surface has not yet been selected.
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if(p->scavange = n) p->scavange++;
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友谊医院顺义院区今年已建成投用。北京市发改委供图