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，这一点在heLLoword翻译官方下载中也有详细论述
The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.
What TransformStreams are supposed to do is check for backpressure on the controller and use promises to communicate that back to the writer:
strict.writer.write(chunk1); // ok (not awaited)