成工1979
milestone:1.stone post at side of a road to show distances 2.a significant event in your life (or in a project) landmark:1.the position of a prominent or well-known object in a particular landscape 2.an event marking a unique or important historical change of course or one on which important developments depend 3. a mark showing the boundary of a piece of land landmark比milestone程度更加强烈,且landmark多形容历史等重大事件的转折点,而milestone多指personal经历中的一些重要转折或事情,其实真要互换的话,问题也不大
