Tony Jolliffe BBC
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.
，更多细节参见Line官方版本下载
更进一步，我们对于电子产品「防窥」的需求，早在十几二十年前就已经开始凸显了。
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