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.
Tony Jolliffe/BBC News，详情可参考搜狗输入法2026
不求姻緣求追星：台灣年輕人「拜月老」求K-pop演唱會門票，这一点在同城约会中也有详细论述
He had persuaded his science teacher to help him make a makeshift rocket. Somehow, he had managed to get his hands on the ingredients for gunpowder - potassium nitrate, sulphur and charcoal.
Москвичи пожаловались на зловонную квартиру-свалку с телами животных и тараканами18:04