Transforms don't execute until the consumer pulls. There's no eager evaluation, no hidden buffering. Data flows on-demand from source, through transforms, to the consumer. If you stop iterating, processing stops.
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Statistics of what works best，更多细节参见同城约会
В России ответили на имитирующие высадку на Украине учения НАТО18:04。谷歌浏览器【最新下载地址】对此有专业解读