[] an event, achievement, etc. that is seen as very important, especially one that is the first of its kind里程碑◆The introduction of wind power is an important landmark for the industry.引入风力发电对工业是一个重要的里程碑。◆This is a landmark agreement that will promote freer world trade.对于促进世界贸易更自由，这项协定具有里程碑意义。◆a landmark court case/decision/ruling具有里程碑意义的诉讼案件／决策／裁决