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.
1988年大学毕业后，刘建军先后在建设银行、招商银行履职，历任分行副行长、行长，零售部副总经理、总经理、总行业务总监等职务。
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