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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.
，更多细节参见safew官方版本下载
德国华裔导演杜耀豪历时四年半制作了纪录片《你豪吗》（Hao Are You），探寻母亲支离破碎的家族历史。（受访者供图）
The false positives at the bottom