If this was tetanus, you got this tetanus vaccine when you were young; you get a boost every five or ten years because your antibody levels are starting to fall.

以破伤风为例,小时候,你接种过破伤风的疫苗,每隔五年或十年要再接种一次,这是因为体内的抗体浓度会下降

耶鲁公开课 - 生物医学工程探索课程节选

And although you enjoy it, sometimes you also enjoy reminiscing about the old days when you were young.

你非常享受这种生活，但有时，你也会回忆起你们年轻时的岁月。

Do you ever课堂 - SpeakingMax英语口语达人

When you were a young boy, you would've studied just reading and writing Homer.

希腊男子在幼年时，要学习阅读书写荷马史诗。

耶鲁公开课 - 新约课程节选

Do you ever think about when we were young?

你会不会回忆起我们年轻时的岁月？

Do you ever课堂 - SpeakingMax英语口语达人