landmark birthday
noun [ C ] mainly US uk/ˌlænd.mɑːk ˈbɜːθ.deɪ/ us/ˌlænd.mɑːrk ˈbɝːθ.deɪ/ (also milestone birthday)
意义非凡的生日，里程碑式的生日（如18岁、21岁、30岁、40岁等等）
a special birthday such as your 18th, 21st, 30th, or 40th birthday
Forty, more than any other landmark birthday, seems to mark the moment when we make a reassessment of ourselves. 四十岁的意义超过其他任何一个里程碑式的生日，似乎标志着一个我们重新评估自己的时刻。
She confined her landmark birthday celebrations to a low-key restaurant lunch. 这是一个具有里程碑意义的生日，她只低调地在饭馆里吃了个午餐。
- More examples
- Those 30, 40, 50, 60 landmark birthdays never meant anything to me.
- He admits these landmark birthday celebrations aren't the most comfortable experiences.
- As he celebrated his landmark birthday at Strachan House care home, he shared a century of memories.