– Reason about how current the time of day, and the weather each affect the view, and add details to the scene.
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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.。谷歌浏览器【最新下载地址】对此有专业解读
曾经的县城“黄金地段”（图：南方人物周刊记者 刘璐明）