I'm three years old. Maybe I don't know what "pulls up" means.

我三岁，可能我不知道“停下来“是什么意思。

耶鲁公开课 - 文学理论导论课程节选

She goes here, she's a fourth year. She's three years younger than me.

她在这儿读书，大四了。她比我小三岁。

我们是校园情侣 - SpeakingMax英语口语达人

My niece drew a picture of my family once when she was three.

我侄女三岁时画了张全家福

耶鲁公开课 - 死亡课程节选

You know it all started when I was three."

这得从我三岁时说起“

哈佛公开课 - 幸福课课程节选

Typically--I don't know for those particular children, but typically on those tasks three-year-olds and young four-year-olds tend to fail, and around the age of four or five kids tend to succeed.

我不太了解那些特定儿童的情况,但一般来讲,三岁和刚进入四岁的儿童,通常会在这些任务中失败,而四岁或是五岁左右的儿童则通常会成功

耶鲁公开课 - 心理学导论课程节选