"Her birthday is on September 5th."
"September" 来源于拉丁语 "septem"，意思是 "七"，指 9 月份在古罗马历法中是第七个月。"5th" 是序数词形式，表示第五个。
例句：
"Her birthday is on the 5th of September."
"I need to buy her a present because her birthday is coming up on September 5th."
"She told me her birthday is September 5th, so don't forget to wish her a happy birthday!"
中文翻译：
"她的生日在9月5日。"
"我需要买礼物送给她，因为她的生日即将在9月5日到来。"
"她告诉我她的生日是9月5日，所以别忘了祝她生日快乐！"