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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。业内人士推荐旺商聊官方下载作为进阶阅读
新花都夜总会像1990年代内地县城的卡拉OK（图：南方人物周刊记者 方迎忠）
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