It turns out that sign and--the developmental milestones of sign languages and the developmental milestones of spoken languages are precisely the same.

手语的发展阶段,和口语语言的发展阶段是完全相同的

耶鲁公开课 - 心理学导论课程节选

there are some milestones in insurance that I want to mention.

还有一件重要的Another important–- 我想讲讲保险业发展过程中的里程碑式事件

耶鲁公开课 - 金融市场课程节选