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.
Both nations are planning to land at the Moon's south pole - and are competing for the best spots to build their lunar bases.。业内人士推荐爱思助手下载最新版本作为进阶阅读
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"It provides the propulsion that Orion needs to get us to the Moon."