十月三十一号英文怎么说

"October 31st" 可以说成 "十月三十一号"。

"October" 来源于拉丁语 "octo"，意为"八"，因为它是第八个月。 "31st" 意为第31天。

例句：

"Halloween is on October 31st." (万圣节在十月三十一号。)
"I'll see you on October 31st." (我会在十月三十一号见到你。)
"The deadpne for the project is October 31st." (该项目的截止日期是十月三十一号。)