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事实上，争夺银发人群也早已是大厂的明牌。
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(double)(end - start) / CLOCKS_PER_SEC * 1000,，更多细节参见51吃瓜
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.，这一点在heLLoword翻译官方下载中也有详细论述