0 a special birthday such as your 18th, 21st, 30th, or 40th 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)
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.