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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Ministers are examining ways to ease the burden of student loans after weeks of pressure over a policy pulling more people into repayments, the Guardian understands.，更多细节参见Line官方版本下载
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