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.
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三十年前，秘鲁在恶性通胀与内战阴影中推进产权改革，经济一度重回增长轨道；三十年后，总统频繁更替、政治对立加剧、制度信任崩塌。德索托的名字，既象征一种发展理论的希望，同时也提醒我们：一个国家的命运，从来不只是经济学问题，更是制度能否持续运转的问题。
"We've been seeing some families come in for years," says Twig's vice-president Ben Hartwig. "Cases get passed down and the next family member gets to bring them in.
值得关注的是，京东集团创始人、董事局主席刘强东以探海游艇实控人身份出席了项目签约仪式。