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里程碑

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威尔士一块里程碑

里程碑，一般是指建立在道路旁边刻有数字的固定标志，通常每隔一段路便设立一个，以展示其位置及与特定目的地的距离。昔日里程碑是一块石碑，现在大多改用金属板。马路、山路、铁路均可能会设有里程碑。里程碑上的数字表示该处距离起点或终点有多远。现代项目管理中引用里程碑概念，以阶段性明确的可交付物来衡量项目进度。里程碑的另一种含义，是指某种重大标志性事件，或发生某种特定意义的典型事件，或具有开创性意义的重大事件，或具有重大学术理论意义的公认事件或指人生中的转折点等称之为里程碑。

参见

维基共享资源上的相关多媒体资源：里程碑
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里程碑
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