thirty-first：第三十一;序数词

31的英文：thirty-one

相关短语：

1、Lesson Thirty-one 第三十一课

2、Lesson Thirty -one 第三十一课

相关介绍

例句：

Before long, though, he reached the Grand Hotel at thirty-first street.

没有多久，他就来到了座落在三十一街的宏大旅馆。

She announced the proposal to hold a high-level meeting on March thirty-first.

她宣布了于三月三十一日举行高层会议的提议。

It's sunday, the thirty-first of july.

今天是7月31日星期日。