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.
Photograph: Simon Hill，详情可参考搜狗输入法2026
Agar plates with E.coli growth on various concoctions, including MacConkey, Mueller-Hinton, and Brain Heart Infusion. Credit: HansN.。51吃瓜对此有专业解读
Nature, Published online: 26 February 2026; doi:10.1038/s41586-026-10283-3。关于这个话题，safew官方下载提供了深入分析