这几天，王守芬老人一直盼着响起熟悉的敲门声。王守芬自幼患有小儿麻痹症，几十年来一直独自生活。自从去年重阳节前夕王守芬在家中不慎摔伤后，马怀龙常常拎着新鲜菜肉上门，帮她做饭、打扫卫生，带她换药复查。王守芬感受到了马怀龙的真诚，主动把钥匙交给了他。
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Blockchain already being adopted by some big-name companies, such as Walmart, AIG, Siemens, Pfizer, and Unilever. For example, IBM's Food Trust uses blockchain to track food's journey before reaching its final destination.，这一点在WPS下载最新地址中也有详细论述