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.
内容驱动与“本对本”模式的崛起
，更多细节参见WPS官方版本下载
But in the video itself, the signs on Croydon's North End are in English, the cyclist has no balaclava and Caz is giving him the thumbs up after a friendly chat.
async function* adapt(input) {
Well, yes, because that was the state of technology in the 1930s. But it would