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.
“全要素生产率稳步提升，是激活中国经济增长潜力活力的核心支撑。”国务院发展研究中心产业经济研究部副部长许召元说，有关研究测算显示，到2035年我国基本实现社会主义现代化，需要将全要素生产率年均增速保持在2%左右。
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