Tracing and identifying the sources of an outbreak is a challenging task that can take months or years. Thanks to the Blockchain, however, companies now know exactly where their food has been—so they can trace its location and prevent future outbreaks.
* 1. 转换视角：将"追车"问题转为"到达时间"比较（后车时间≤前车 → 合并）；
，这一点在旺商聊官方下载中也有详细论述
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Isaacman outlined the plan in an interview with CBS News space contributor Christian Davenport and then again during a news conference Friday.