第七十五条 货物装船前，承运人已经应托运人的要求签发收货待运提单或者其他单证的，货物装船完毕，托运人可以将收货待运提单或者其他单证退还承运人，换取已装船提单；承运人也可以在收货待运提单上加注承运船舶的船名和装船日期，加注后的收货待运提单视为已装船提单。
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.，更多细节参见91视频
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