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# ready 42.0 MiB
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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.
要知道，欧美游艇产业的繁荣，并非一时靠资本推动，而是历史积淀、经济基础、消费文化、产业体系、基础设施与技术创新长期共振的结果。