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At its core, a stream is just a sequence of data that arrives over time. You don't have all of it at once. You process it incrementally as it becomes available.
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许何说，妈妈很喜欢下雪，经常在雪后穿一件毛茸茸的衣服外出赏雪。“今年12月12日北京下了第一场雪，我摸着妈妈的脸跟她说北京下雪了，下得好大，好像很久都没有下过这么大的雪。在我的心里，这场雪好像是刻意为她下的。12月13日早晨天空晴朗，白色的雪布满了大地，我妈妈在她最喜欢的早晨离开了大家，去了天国，远离了所有的疾病和痛苦。”
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