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.
美国慈善家、乔布斯的遗孀劳伦 · 鲍威尔 · 乔布斯，为整部文集写了一则非常具有智慧和启发性的引言，其中她提到了里尔克的一个金句：
，这一点在同城约会中也有详细论述
（三）阻碍执行紧急任务的消防车、救护车、工程抢险车、警车或者执行上述紧急任务的专用船舶通行的；
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