milestone|milestones

毕业是人生重要的里程碑。

Graduation is an important ___milestone in life.

每公里都有里程碑标记，帮助我们计算行驶距离。

There are ___milestones every kilometer to help us track the distance traveled.

宝宝学会走路是成长过程中的一个重要里程碑。

Learning to walk is a major ___milestone in a baby's development.