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Stream.pull() creates a lazy pipeline. The compress and encrypt transforms don't run until you start iterating output. Each iteration pulls data through the pipeline on demand.
。关于这个话题，同城约会提供了深入分析
我百无聊赖想开电视，却发现春晚还有两小时才开播，屋里屋外，静得只能听见妈妈的脚步声。
strict.writer.write(chunk4); // ok (pending buffer fills)