thirty-one:三十一;可作数词(表示数量/编号/年龄等)或作形容词(修饰名词,如 a thirty-one-day month)。
/ˌθɝːti ˈwʌn/
I’m thirty-one today.
我今天三十一岁。
Thirty-one students signed up for the course, which was more than we expected.
有三十一名学生报名了这门课,比我们预期的还多。
由 thirty(三十)+ one(一) 组合而成。thirty 来自古英语 þrīttiġ(与 “three” 同源),one 来自古英语 ān,都属于最基础、最常用的日耳曼语系数字词。