a stone or post at the side of the road on which is printed the distance to various places , especially to the nearest large town
发音
例句
1. The film proved to be a milestone in the history of cinema. 事实证明这部影片是电影史上的一个里程碑。 2. I think this is a very important milestone in the relations between our two countries. 我认为这是我们两国关系中一个十分重要的里程碑。