- By 2014, that milestone (里程碑) had shifted to age 29.
2019年6月四級(jí)真題（第一套）閱讀 Section B
- It is a milestone in human progress.
出自-2013年6月閱讀原文
- It was a huge milestone in the development of smartphones, which are now owned by a majority of American adults and are increasingly common across the globe.
2018年12月六級(jí)真題（第一套）閱讀 Section C
- Some experts even consider lying a developmental milestone, like crawling and walking, because it requires sophisticated planning, attention and the ability to see a situation from someone else5 s perspective to manipulate them.
2019年12月六級(jí)真題（第一套）閱讀 Section C