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.
Раскрыты подробности похищения ребенка в Смоленске09:27
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也許他確信美國人將開始感受到其政策的經濟益處。或者，他相信在今年夏天國家250週年慶典期間，愛國情緒將再度高漲，改變氛圍。